Well, now I'm really convinced Hojo's the Wheel-chair guy. The stuff megmurry showed was very convincing. Here's my theory why Hojo is doing this. The last, and only, time you fight Hojo, he's trying to give all the power he can to Sephiroth. Once again, I think when Sephiroth died, his powers were recycled in the Lifestream into the children. Hence, the Children in Advent Children. But these kids look older than 2 years old, so the real Sephiroth probably died in the Nibelheim incident 7 years earlier. Hojo probably never died, the gang just pummeled him within an inch of his life, and he's now in a wheelchair all distorted looking. The Silver-Haired Men were probably early experiments of Hojo or born of Mako energy hence the Mako eyes. Hojo is probably having them gather the children who were recycled from Sephiroth. This might result in the come-back of Sephiroth, like another reunion. But like I've said before, we'll have to wait
Imagine Advent Children wasn't computer animated - but live action. If you were chosen to cast hollywood real-life actors to play the characters - who would you choose and why?
All I know is that i'd have Jude Law and Scarlett Johansson in there somewhere. >:D