At some points you get the feel Terra moments was a thing but they seem dropped now. </3
DDD more or less rendered MX's "nobody enforcer" as one member once put it.
Cause disney magic! [jk]
Joking aside Xehanort will likely be his own downfall. He's not the most powerful and he underestimates the heart repeatedly. I look to see his downfall to be an ironic one brought about by his own personality.
Which is a pretty bad mistake; considering how extensively he's studied the heart in the past. I'd honestly expect more from the oldest, wisest Keyblade Master in history.