*Contradiction claim #1: Maiden says that "the entire planet's consciousness was awakened," while her 10th Anniversary Ultimania profile says she used only a "portion" of the Lifestream to stop Meteor.
While at first glance this does seem like a contradiction, no where in Maiden did it say how much of the Lifestream was used to stop Meteor. Yes the entire planet's consciousness was awakened, and everyone was helping, but just because she had the entire Lifestream at her disposal doesn't mean she used all of it. Also the video at the end of the game shows parts of the Lifestream still spreading off the horizion which would mean much of the Lifestream was not actually near Meteor.
Conclusion on contradiction claim #1: These two ideas are not mutually exclusive. This is not a contradiction with the original game or with the wider compilation.
*Contradiction claim #2: In Maiden, Aerith meets up with Hojo's Spirit, but in Dirge of Cerberus, it is revealed that Hojo's spirit was uploaded into the World Wide Network.
Again, yes this does seem like contradiction at first, but the problem with this one is the information isn't accurate. Hojo did not upload his actual spirit into the Worldwide Network, but digital copies of his mind. Lucrecia refereed to her own fragments as a mind copy, as she states in DoC:
Jenova's cells... Vincent... Stored as data... Must leave... Thought... I loved... Record.. Memory copy... For him... It was wrong... Wait... Disperse... ...so sorry... Apply... ...but I... For... Fragment... Survive... Hope... who...? - Lucrecia, Dirge of Cerberus
These fragments are shown interacting with Vincent and Shelke despite the fact that the real Lucrecia is shown to be alive and behind a waterfall, encased in crystal. So these fragments are simply a copy of one's original mind, not their actual spirit. It is also revealed that Hojo began to extract his fragments before Avalanche actually fought him. The opening to DoC shows Vincent finding Hojo now laying motionless in front of the cannon's computer terminal, of which one of the screens says "start fragment program." In other words, the copy fought in DC was created before Hojo even battled AVALANCHE (there sure wasn't any lab equipment on top of the Sister Ray for scanning and recording one's mind), and distributed into the worldwide network immediately before he died. The copy is simply that, a copy. Not the original Hojo. Hojo's spirit is in the Lifestream and his copy is in the Worldwide Network
Second, while in the official English version of DC, Hojo's copy says, "Three years ago, while I was still running about looking for Sephiroth, I took it upon myself to distribute my data-- my mind, my knowledge, my inner being, across the worldwide network," the Japanese text from that scene says something different:
"Into the Worldwide Network, I scattered my fragments ...... my mind ....... data of my thoughts and knowledge." Here, the copy specifically refers to itself as fragments -- which we know, thanks to Lucrecia, to be data that is a copy of someone's mind. Hojo's copy further explains that fragments -- and, therefore, itself -- are "data of my thoughts and knowledge."
As explained in DC, these fragments were left behind as a failsafe in the event that something untoward should happen to Hojo after injecting himself with JENOVA's cells during the original game:
I attempted to perfect my body for Omega by injecting myself with Jenova's cells. However, that didn't go as I had planned.
I failed to consider the fact that the cells might try to take over my mind and eat away at my soul.
And so, as a safety measure, I came up with a brilliant plan to transmit my neurodata across the worldwide network. - Hojo, DoC
He then distributed the recorded fragments into the worldwide network with his final breath after being defeated by Cloud and co. atop the Sister Ray during the original game. This is depicted in DC's opening, where Yuffie detects life signs still at the top of the cannon during an evacuation of the area on the night Hojo was killed.
Granted, there is a moment where a ghost-like apparition of Hojo arises from Weiss's body after Vincent defeats him in battle prior to Omega's awakening, but by that point, Hojo's fragments had come to inhabit that living body. Given FFVII's cosmology -- in which the memories of the dead are recycled into new spirit energy to give life to new living things -- what could the thoughts and memories that inhabit and act through a living body be called but a spirit, even if they began as computerized data? The copy is simply that, a copy. Not the original Hojo. Hojo's spirit is in the Lifestream and his copy is in the Worldwide Network
Conclusion on contradiction claim #2: This contradiction claim contains inaccurate information and is therefore not a contradiction with the original game or with the wider compilation.
*Contradiction claim #3: Maiden says that all the Cetra have diffused into the Lifestream yet in Case of Lifestream White, Aerith is able to rally many of the Cetra to help her.
Yet again, it sounds like a legitimate contradiction, but again, it is not. While her mother, the last living Cetra before her, is said to have become one with the planet, the fact is also that the Cetra Aerith gathers in Case of Lifestream White are said to be fragments of consciousness. Here is a quote from CoLW:
Having lost the core of their emotions, the surface animosity disappeared. The woman had found a solution, however more and more spirits steeped in spite appeared, and it was too much for her to bear. She rushed through the Lifestream in search of other souls to help her. Ancients, on the verge of diffusing. These fragments of consciousness accepted her undertaking.
In other words, the Cetra she gathers in CoLW were already diluted and weren't really spirits anymore. They were fragments. It wasn't until CoLW that she figures out how to bring them back into a conscious form to help her. If anything, this seems to back up what Maiden has presented and tells us that even though the Cetra had been diffused in Maiden, Aerith found a way to have them help her in CoLW.
Conclusion on contradiction claim #3: This is not a contradiction with the original game or with the wider compilation and is actually CONSISTENT between both stories.
*Contradiction claim #4: In Maiden Aerith and Zack witness Tifa reconstruct Cloud in the Lifestream but in Tifa's Crisis Core Ultimania profile it says that Tifa becomes the "only witness" to his blurry memory during the original game, and that she also plays an important role in him regaining his true self .
This is a case of selective reading. The quote in Tifa's profile says that Tifa became a witness to his blurry memories and ALSO helped put Cloud back together. It's talking about two separate events. Tifa was a witness to Cloud's blurry memory because she was the only one of the group that knew his memories were off. LATER, she helped put Cloud back together. And if the quote IS talking about the Lifestream event, right before Tifa enters into Cloud's consciousness she talks to some spirits, eventually falling over and clutching her head as she hears them moan and speak to her. She was SURROUNDED by spirits, so it would make sense that there would be many spirit witnesses to what happened with Cloud, not JUST Aerith. So this quote in Tifa's profile is either saying Tifa was the only living witness OR it is contradicting the original game, therefore it's not Maiden doing the contradicting.
Conclusion on contradiction claim #4: Maiden itself is NOT contradicting the original game or the Compilation, but Tifa's profile might be, but if it is, it's the original game.
*Contradiction claim #5: In Maiden it says that Sephiroth's consciousness smiled and laughed after Cloud defeated him, but in the original game Sephiroth is only shown being shocked.
Reading Maiden closely, it actually says that Sephiroth smiled trying to resist his defeat, but ultimately succumbed.
The mad apostate angel smiled boldly. But the damage he had taken was far beyond what he could endure and his spiritual body started to fall apart as he laughed. Beams of light blasted out from inside his body as if they were cutting him apart. - Maiden of the Planet
The statement seems to say he smiled, laughed and then the beams shot out. When we, the players, see Sephiroth after the battle, the first thing we see is the beams. There may have been a brief moment before Cloud dealt the finishing blow that Sephiroth did smile or laugh, before he looked up at Cloud in shock. This is really more of a case of Benny putting what he thinks happened into the story, and because we never see it happen, it can't be disproved.
Conclusion on contradiction claim #5: This is not a contradiction, but merely Benny adding his own interpretation of the scene.
*Contradiction claim #6: Maiden says that Aerith met Zack when she was 17. She was 15 when she met him in Crisis Core
Again, if you read Maiden you'll find out it says no such thing. It says Aerith was attracted by Zack's smile when she was 17. It does not say that's when they first met. She was 17 when she last saw Zack, so she may just be remembering the last time she saw him or explaining where her focus was at the time. This answer might seem a bit nit picky, but so are many of the "contradictions."
Conclusion on contradiction claim #6: This is not a contradiction with the original game or with the wider Compilation.
*Contradiction claim #7: In Maiden, Zack says to Aerith that Omnislash was his technique, though he never used it in Crisis Core.
The first thing I want to point out is that in Birth by Sleep, Zack actually DOES use Omnislash. However since AU games don't hold much water here, this seems to be a case of Zack trying to charm Aerith one last time. He is very flirtatious and playful after all.
Conclusion on contradiction claim #7: This is not a contradiction with the original game or with the wider Compilation, but in fact, very in character for Zack.
*Contradiction claim #8: As shown by the ending of Crisis Core, Aerith should have known that Zack was dead. She was able to sense when Elmyra's husband died, yet in Maiden she is completely shocked to see him.
The simple fact is, we don't KNOW what Aerith felt at the end of Crisis Core. It may have been she felt Zack died, or it may have been she just felt something bad happened. The reason she was able to sense Elmyra's husband's death, was because he came close to try to see Elmyra. Aerith's words in this case are, "Someone dear to you has just died. His spirit was coming to see you, but he already returned to the planet."
Also the 20th Anniversary Ultimania Character files says that Aerith didn't know Zack was dead.
At the time this story begins, Zack is already dead, but Aerith does not know this truth. - 20th Anniversary Ultimania page 197
Conclusion on contradiction claim #8: This is not a contradiction with the original game or with the wider Compilation.
*Contradiction claim #9: In Maiden it's said that Zack's smile attracted Aerith to him. In Crisis Core, it's established that his eyes attracted her to him
If anything is a legitimate contradiction, it's this one. However this is an extremely MINOR contradiction, and not to mention the fact that more than one thing can attract one person to another, in which case, it wouldn't really be a contradiction at all.
Conclusion on contradiction claim #9: Of everything listed, this seems to be the one true contradiction, but it does have a case against it.
*Contradiction claim #10: Aerith acts too cold to Zack in Maiden, she should have been a lot nicer to him given their interactions in Crisis Core.
This is more or less based on one's opinions on the game itself. Many people believed Aerith to be over Zack, and this is just more proof she's moved on. This seems to be backed by FFVII Dismantled and Case of Lifestream White where she expresses her fondness for Cloud but never mentions' Zack. Some people will argue that she only spoke of Cloud because she saw Sephiroth and was forced to remember him, and had she thought of Zack first she'd have acted the same way. This maybe true, but it might not be. We can't make any conclusions like that because it didn't happen. And until it does, this is in fact, not really a contradiction at all.
Conclusion on contradiction claim #10: This is not a contradiction with the original game or with the wider Compilation.