I don't see the difference from before
Also, re NC and LS sequences: for the NC scene, I don't think there will be anything else than the Nibelheim incident at play. Because it's very important to convey to the player that what makes Cloud break is the fact that
Tifa doubts him. Because I feel that this sentence "it's only your opinion that counts" that makes Tifa realise that she needs the truth, that she wants to believe in him. It is their bond being tested while they're being manipulated and gaslit by Sephiroth and... it does not break. Cloud breaks, but not their bond and this is why she decides to search for him after this. If you put Aerith's death here, it will muddle the message as well as the message that their bond is being tested, it makes less sense for Tifa to search for Cloud after this. Despite everything, you have to show that the connection is still here for this scene to work, as well as the following ones.
For the Lifestream sequence, I'm still surprised at how many fans don't get that the first part of this sequence is a huge love confession (the second part being the resolution of the Nibelheim incident); I mean it's even said that this is where they realise their feelings for each other there but people stubbornely refuse to take this into account when crafting theories. This cannot be a group project, at most we'll have Aerith (and Zack?) guiding them in the Lifestream, protecting them, but that's as far as it can go. Yes, the Lifestream scene will definitely be expanded upon; it is not a surprise as we see Tifa being aware of one of the core elements, ie Cloud actually trying to help her in Mt Nibel when they were kids - that one memory that PROVED that Cloud was the true Cloud, which means they'll have to rely on something else now to prove that. We also see the Black Whispers attacking Cloud's memories in the Lifestream at the end. To me that shows expansion of the scene with new additions, however as the Weapons fled the place of the Lifestream memories, one has to wonder what happens then to Cloud's memories. IMHO they will have to talk a lot more about memories and their feelings associated, Cloud's hopes and dreams (Cosmo Canyon speaks a lot about the essence of the Lifestream being
more than just memories, so I think we'll see that). I have said it before but to me, CT is probably one of SE's greatest love stories and we will see that being developped inside the Lifestream.
On a side note I was watching Welonz yesterday playing and she said that Cloud and Tifa never really had a conversation about their fight in Kalm, that the topic had been avoided so far. And yes, of course as a new player you can't understand this, but the Kalm fight is a setup not only for CT to open up about each other in Rebirth, but also for the NC and LS scenes - I realised this as she was talking about it.
Honestly for Aerith's death, I see it more as an aknowledgement later on when they return to the city of the Ancients and we can have her death and burial for real, that Cloud admits he imagined having saved her when it was not the case. Because, it is what happened there. The same way we need to have an aknowledgement on how Zack's death traumatised him as well as what happened after Cloud beat Sephiroth - this part was left out in the OG outside the Lifestream scene because it had no place there, and I feel the same towards Aerith's death.