That possibility certainly exists. However, Disney villains haven't really been important to the main plot, with the exception of Maleficent. Others like Jafar only contributed in the first game.
Still, seeing another Disney villain be important to the plot would be nice. Especially with Mother Grothel's backstory, it would make things interesting.
Lol, regardless if The Keyblade War happened 400/500 years ago or 1000 years ago, I'm sure she knows something about it that neither the old coot nor his vessels knows. She is older than the entire KH cast (except from a really few characters like Hades, who is a god, Genie, Chernabog, possibly Ventus and others).
That's a good point. She goes to the flower for centuries and stays alive for all that time. It does make you wonder if indeed she has any idea about the Keyblade War. I am leaning toward no, but you never know.
Well, they shouldn't, but KH characters somehow know there are other worlds and events that took place in them (e.g King Triton somehow knew about The Keyblade War back in KH1, Master Xehanort informed Maleficent back in BBS about outside worlds).
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