>>528347920
I do wonder if the characters the Foretellers seem to echo are meant to factor into MoM's "safety plan" when it comes to using his apprentices as vessels for Darkness. Maybe each Lost Master will require a keyblade wielder with a strong enough heart to be the true backup vessels that need to be sacrificed to destroy Darkness for good, hence why the only way to defeat Darkness in MoM's eyes is to travel to the future where these perfect vessels exist. Aqua, Terra and Riku have definitely built a strong resistance to Darkness which would probably allow them to become vessels without losing themselves to it. Ventus already has Vanitas though so Gula would have to go for Sora or Roxas.

>>528388447
Also Ava being a fox which in Japanese culture can be a a trickster who creates various illusions like she does in X would fit well with her being called a witch in CoM. Both Ava and Namine have a gentleness to them but they've both been forced to do dark things. And there would be some irony or poetic justice in a way considering Marluxia traps Namine and it was sort of Ava's fault Strelitzia was killed because she was chosen to be a Union Leader making her a target.