My new theory summary for Kingdom Hearts:Birth By Sleep

[1-up salesman]

Okay, here goes:

Master Xehanort, used to be Terra's master. Terra left him becuase of his evil deeds. Ven has no memory of his past life and does not now why he has a Keyblade. He is friends with Terra and Aqua. Dark Soldier (Or Master Xehanort's Apprentice) could be the real Xehanort, that was in KH, KH:Com and KHII. Or, Terra could lose his memory and be that Xehanort. And that's exactly what I think. Guess What?! I was looking on Kingdom Hearts Wiki, and I was reading about Xehanort. It was saying that he had no memory of his past life, but it said that all he remembered was a Great Keyblade War, or he had lost his memory of it.

OHMYGOSH TERRAIS XEHANORT!!!!!!!