I'll get the drinks. xP
To be honest, I think you're intellectually reaching here. You make the concept sound intelligent by opting not to address it at face value: every rule that time travel has in KH was contrived with the singular purpose of making it a viable method by which to have YMX appear in the story. There is no other reason for it to exist within the series as such, no matter how one glamorizes it with philosophical window dressing. This, for me, reduces it to a lazy form of deus ex machina. The same goes for the character of YMX himself, a character who, in my mind, has yet to justify his own role in the story of DDD. All things considered: he came, he made some vaguely ominous observations, did nothing that wasn't already going to happen, gave no indication (in fact, could NOT give any indication) of what was going to occur in future installments, and he made for an average to decent final-ish boss fight. Even his identity was never an enigma: he looked like Young Xehanort, he was Young Xehanort, and despite Nomura drumming up the hype for his big, important revelation, he lacked any noticeable impact on the game as a whole. He was, well, forgettable. He could have zero screen-time in KH3 and I wouldn't miss him.
All of that said, of course I totally appreciate that you take something more away from this element of the story, and I don't mean to undermine or invalidate your enjoyment of it. I see it for what I feel it is; you see it for something more, and that's totally ok. I've had to do some mud-slinging with people over characters like Xion (whom I adore) and pretty much the entirety of KH2 (which I disparage in jest but really do treasure), so I'm no stranger to the notion that a differing opinion is just that.
To be honest, I think you're intellectually reaching here. You make the concept sound intelligent by opting not to address it at face value: every rule that time travel has in KH was contrived with the singular purpose of making it a viable method by which to have YMX appear in the story. There is no other reason for it to exist within the series as such, no matter how one glamorizes it with philosophical window dressing. This, for me, reduces it to a lazy form of deus ex machina. The same goes for the character of YMX himself, a character who, in my mind, has yet to justify his own role in the story of DDD. All things considered: he came, he made some vaguely ominous observations, did nothing that wasn't already going to happen, gave no indication (in fact, could NOT give any indication) of what was going to occur in future installments, and he made for an average to decent final-ish boss fight. Even his identity was never an enigma: he looked like Young Xehanort, he was Young Xehanort, and despite Nomura drumming up the hype for his big, important revelation, he lacked any noticeable impact on the game as a whole. He was, well, forgettable. He could have zero screen-time in KH3 and I wouldn't miss him.
All of that said, of course I totally appreciate that you take something more away from this element of the story, and I don't mean to undermine or invalidate your enjoyment of it. I see it for what I feel it is; you see it for something more, and that's totally ok. I've had to do some mud-slinging with people over characters like Xion (whom I adore) and pretty much the entirety of KH2 (which I disparage in jest but really do treasure), so I'm no stranger to the notion that a differing opinion is just that.