Hollow Bastion/Rafiant Garden is sort of a Final Fantasy world(does Radiant Garden have anything to do with "Seipher's Balamb Garden? I haven't played FFVIII), but I think I agree with fully Final Fantasy worlds and stories(but I'm not sure how they'll be able to do it, what with all the characters they've already established KH stories for). As for the Nobodies, I don't think they'll be gotten rid of completely before the final game
.