Unless SE releases KH 1.5 and the presumably KH 2.5 (it's coming, obviously) on the 360/Xbone then I don't see how KH3 on the Xbone alone will be a good experience.

The problem with KH is how confusing and messy the entire plot and timeline is, like it is even more confusing than MGS.
You can read up dozen of pages and watch walkthroughs on YT, but the KH experience just isn't the same without playing everything.