if you think about it, none of the disney character villains really died
Clayton had the heartless lizard collapse on him....
Jafar just disappeared into his lamp.....
Hades flew into the underworld where we heard him screaming noooo.......
Oogie Boogie transformed with his house and then sort of collapsed into the ground.......
Captain Hook I believe fell off his ship or something or was being chased by the alligator.......
and Maleficent..... I guess I can say maybe she died.... cuz she turned into the dragon and then just made an imprint on the ground when sora beat her silly with the keyblade and then the imprint disappeared........
and Ursula just disappeared into the black smoke and like shrunk or something.......
so in all reality it seems like maybe only the leader of the disney villains died