Between resurrecting an old thread or starting a new one... I decided to just continue the conversation here.
Warning, this may be speculation. Please don't read this and look for canon answers. I'm not making stuff up but asking about my interpretation/head canon.
Elsewhere, we've been discussing some of the unique powers we can probably assume are remnants of the magic of the Cetra (their descendants). We have this weird Inspire bit for Reeve (now some of this was just development, so it's hard to know what's just unsaid here), the SND dive for Shelke, and arguably all of the Tsviets have something too.
Now, before Before Crisis, I was under the impression that the Turks' "official" job was to find SOLDIER recruits, and after BC came out I became a bit and truly puzzled. If this were true, they were meant to find suitable candidates, why weren't the Turks candidates? They were strong, resilient, loyal, driven, and frankly, strong willed. I've always assumed someone like Rude would make a good SOLDIER.
But the puzzle pieces are here. Roche and his motorcycle make me think of this even more.
Are SOLDIER candidates only SOLDIER candidates if they display a possible Cetra connection-some unique power that we may read as latent magic, that could be "awakened" by Jenova Cells and Mako bathing?
Zack has a weird power to push his emotions through a limit break, while channeling the memories of those he loves.
Genesis and Angeal were discarded as youths as they were deemed failures - they didn't show any signs of enhancement then. (But maybe kept among Shinra employees in order to see if they would show signs later in life?).
Sephiroth certainly is exceptional among humans. Not just strong but his read on people and affinity for magic I think.
Do we ever have confirmation that this idea is or isn't true? Is it all just reading in between the lines?
Finally to the above question about SOLDIER 1st Class, I'm under the impression, but no confirmation that each "unit" would have it's own 1st class "commander," and I think 13 or 14 units exist, so I imagine there's 14 1st class folks at any one time. Ragnarok Unit is runing around, supposedly the strongest (I honestly imagine this is Sephiroth's unit if it's the strongest, and his successor was the one wiped out over the Tsviets buuuut who knows?) The units are, admittedly, not necessarily shown to be super organized. My guess at this is Angeal mentoring Zack, with Kunsel and Luxiere all seeming to be part of the same cohort. Zack gives his speech to what I presume is his "unit."