Warning:
This theory is surrounded on KINGDOM HEARTS III and KINGDOM HEARTS Union Cross spoilers.
This theory is surrounded on KINGDOM HEARTS III and KINGDOM HEARTS Union Cross spoilers.
Spoiler ShowRemember when the Guardians of Light aimed at Xehanort and shot a beam at him in order to abuse his status as a Portal and create a warp-point that led us into Scala ad Caelum? Well, what if the Master of Masters' plan is to create Portals through every single Worldline in order to freely traverse through them? For all we know, you can only jump from one Worldline, to another, but we haven't been shown whether or not you can return to a previous Worldline you've already jumped from.
But what could be powerful enough in order to use as a Portal to each Worldline?
Yep. You've guessed it: Kingdom Hearts. A "Worldline" is a world, or rather, the universe where worlds and people reside. And what's the collection of those hearts? Kingdom Hearts.
But, what's the point of creating a Portal from Kingdom Hearts?
You wouldn't need to cast your body away, and it can be used as a means to circumvent the rules of time-traveling, and you wouldn't need to do what Luxu did: jump from vessel to vessel for what probably could have been millennia.