And saw the secret ending!
In some parts, it's hard to tell what's going on, but it seems like everyone is the kwizatz haderach in this video. Jesus. I actually thought for a moment that Old Man Murray might be Xigbar, but I seriously doubt it. As Terra=Saix, but nah, I doubt that too. Has to do with golden eyes, but like I said, I seriously doubt it.
As for Ven, I still think it's a separate boy that Sora met and it stuck with him. I don't think Xehanort=Old Man Murray because I've never seen OMM lose his heart. The one in the Riku-like armor could easily have been a young Xehanort, but he came directly from the old man.
Blagh. I think Kingdom Hearts is worse than the Suikoden series when it comes to theorizing!