Forum:Synch Blade Ability

Okay so this wiki site says that Sora can use two keyblades by holding the heart of Ventus.

Why then does Roxas seem to have this ability as a naturally occuring boon?

It would make sense that he is able to control two keyblades because of Xion (my personal favourite theory is that he wields Sora's keyblade as well as his own). Is it only because Roxas is Sora's Nobody that Roxas also contains part of Ventus' heart or is it Xion?
 * This is why we post references. -- 05:51, March 28, 2010 (UTC)