Funny how differently people read things.
- Genesis's wing comes and goes. He begins CC without it; manifests it in front of Zack later (clearly not manifesting it for the first time); it goes away later; he manifests it again in DoC
- Angeal begins CC without his wing, then manifests it in front of Zack later (clearly not his first time either); it goes away when he's mortally wounded by Zack.
We never see them de manifest it, though. Genesis' form goes away when he's healed by divine intervention, Angeals goes away when he dies, along with the rest of his monster form. That's not 'at will'. Could be its a transformation they've been fighting a while.
Sephiroth's kinda a special case, considering he doesn't really have a body at all anymore.
I don't think Angeal approves of Gillian's suicide at all, he's devastated. He doesn't try to defend himself when Zack does blame him, because he really does think it's his fault.
o be honest that's like only one person...
Everyone in SOLDIER?
While the poem follows the main character. He was definitely serious about finding the cure through following the ancient literature and finding the Gift of the Goddess. That wasn't for fun.
He wants to heal himself, but he tries to do it through S Cells, A cells, and Hollander. He just lucks out at the end (although that part always confuses me. His base is Banora, did he know about the giant materia all this time? Why didn't he use it before then?)
Then I have to ask what you think the reasoning was for giving Genesis a big black wing in the text.
Why is the story telling us about this SOLDIER 1st Class, who suddenly goes AWOL and murders his parents, hometown, and subordinates?
Perhaps to demonstrate that their actions
weren't through the influence of Jenova? That other people went through the same thing but reacted differently, that what happened wasn't inevitable at all.
Shinra doesn't have absolute knowledge of what happened in the reactor. No one came hunting Tifa after all.
Mako poisoning is an established condition of falling into the lifestream, the doctor already knows about it when Cloud washes up. It's a thing that happens.
Honestly, the trios motivations are fairly straightforward.
Genesis: I am dying. Slowly. Painfully. I want to fix that, or at least make Shinra pay for doing this to me.
Angeal: I am a monster that is used to create more monsters by mad scientists, which will keep going as long as I exist. Therefore, I need to not exist.
Being a monster is
not a minor detail in this world. They're a real danger that regularly kill people. It's a legitimate concern, not empty whining. The only person he can trust to do it and not put him in a lab and harvest him is Zack.
Sephiroth is also not as irrational as he appears. He finds out that his mother is a research specimen, is alive, and is being harvested for her cells in Nibelheim reactor. Priority 1 is to break her out, and wreak revenge on the humans that did this to her.