-- In the end Roxas is able use two keyblades. Is this because he now has Xion’s?
Nomura:
Well, it isn’t that Roxas has physically inherited Xion’s keyblade, but more that Xion has awakened it within Roxas. In the KH series there are a lot of complex reasons why someone can use a keyblade, but basically you need a “heart” to be able to wield one. So strictly speaking, they are being influenced by Sora. At the present I can’t say more than that, since it would go into whether or not Roxas has a heart. And there is also a part that has to do with Xehanort’s memories. This time there were connections to the Kingdom Hearts secret movie, and the time will come when this will have a clear connection as well. You’ll just have to ask me then.
Awakened within Roxas? Linked to Sora? Xehanort's memories? Needing a heart to wield a blade? I have a raging boner?
now I'm 85% sure that Roxas had Ven's heart.