we just haven't seen a Disney child character in KH1 and then the same character in KH2 to discern a difference.
Huey, Dewey, and Louie says, "Hi."
It could be treated quite differently in that case.
Huey, Dewey, and Louie disapproves your statement.
Since the time does affect all of the characters, if someone can't physically exist in the past then that does present an issue regardless of "Disney magic" to the other character's appearances.
Yet we don't know if Alice exist in the time of BBS or not, now do we. =/
Bleh, so much work. Let me look for it.
Please do. ;3