Y'know, I was thinking, like a sort of plot-twist that involves revealing that, the Master Xehanort we see "forming" in Where Nothing Gathers, is actually another Xehanort the young version picked-up in another time, while Terra, who's been with the heroes all this time, is actually the real Xehanort (in complete domination over Terra's body, posing as him).
Yesssss, my thoughts exactly. Terranort is still alive and kicking and the MX we see is just another pawn, which is ironic since it's his plan to begin with. That's what happens when you mess with time travel