I hear this EVERYWHERE, but no one can give me solid evidence as to why it's true. Is this just a commonly accepted misconception, or is there something I keep missing?
Spoiler In mission 88, the Organization tricks Roxas and Xion into fighting, each thinking the other was a giant Heartless. How is this possible if the only one in their numbers who could create illusions (namely, Zexion) died in Castle Oblivion?