Spoilers man, spoilers! I've already beaten the game, but not everyone charges through the thing in one go. Use spoiler tags!
Warning, MAJOR MAJOR Spoilers here. Like, end of the game spoilers. Do NOT open this until you've beaten the game.
Spoiler
As for my take.... One part that doesn't make sense to me is the 13 vessels of darkness. Xehanort intends on taking 13 vessels, and putting his own heart into them. That part makes sense. What DOESN'T make sense, is the part where they all come from different timelines. Young Xehanort himself said he'd forget everything that he learned/experienced in the future when he was returned. So that means that all of the other "vessels" would as well once they went back to their timelines. What was the point in bringing all of them to that point in time then? And some of his "vessels" are already dead in the present time. I.E Xemnas, and "Ansem". There are 6 vessels whose faces you are shown altogether; Xehanort, Young Xehanort, Braig, Ansem, Xemnas, and Isa/Saix. Who are the other 6/7? Sora was saved, so there were 6 others sitting there. Are they all simply different Xehanorts from different timelines?
Another thing that REALLY bugs me; Why does Young Xehanort have the same hairstyle as Tera? Tera's body hadn't been consumed yet at that point in time. There must be some implication or plot device I'm missing here. Uuuuuugh my brain hurts.
ANOTHER thing. ASSUMING that the "Mysterious figure" that fights Aqua, Tera, and Ventus at the land of departure was indeed Xehanort, is it an older form that went BACK in time? Why would he go back in time to fight the trio? Did Xehanort somehow lose the ability to control time in his old age? Or does he simply choose not to use it in his fights? So confusinnnnnggggg.
EDIT: ANOTHER ONE. If Xehanort is a "whole person" again, why does he look like old man Xehanort instead of Tera? What happened to Tera's heart? Is it still inside him, or just....out there somewhere? Maybe he got his old body back, but left a piece of his heart inside of Tera to use him as a "vessel"? Are my questions annoying enough yet? I think about and try to flesh out the details of this series too much.