1. I don't have a source, I am on my phone (excuse excuse) its just info I have seen a lot of true square enix fans pass around
2. @crit... do me a favor and look up the definition of the word sarcasm...
I hear a lot of people arguing that rumor about KH and Dissidia.... well I haven't really seen any facts on that one.... and honestly, the game was FF Dissidia. Sora isn't FF in any way, shape or form... So honestly, I think that may be more of why he wasn't in Dissidia... just sayin'.
As for Disney having full rights on Sora... doubtful. They may share the rights, but I wholeheartedly disbelieve any rumors that Disney's got final say with him until I see proof. True, he was made for a game involving Disney, but I'd speculate Square played a MUCH greater role in developing the character, and so i'd be more inclined to believe that they, if either, have greater rights to the character himself.