Well I like the idea, it'd be an interesting spin. I agree that there is a lack of evidence, but there's also a real lack of disproving evidence. Not even going to go into the part about MX summoning Kingdom Hearts from Ven, just saying though that it was MX's keyblade...and goodness TAV picking up the three keyblades was a concept video and them picking the keyblades up doesn't show more than a connection to present day wielders, accept it.