Young Xehanort said:Every Keyblade master is bequeathed a Keyblade of his very own. With the passing of time, as you can imagine, more and more Keyblades were forged to be handed down. But of all the Keyblades in existence, Master Xehanort's is the most ancient.
Decided to revisit this old keyblade. As we go further into the story, we begin to realize just how much of Xehanort's story involves this keyblade. Arguably, the keyblade may become something bigger even than him. We've seen it as far back as KH2FM, through the stories of BBS and 3D, once more in 2.5, and finally in the KH3 trailer, as depicted above.
Particularly with 2.5 and the KH3 trailer, we're given an idea as to how old his keyblade really is. But to drive the point home:
Xehanort's Report VI said:The third type of key, the Keyblade of heart, came into existence when the World was reorganized after the Keyblade War.
If MX's keyblade is to be considered the oldest in existence, then it only makes sense for it to be a relic of the old world (as in, before the reorganization of the Realm of Light). But if that's the case, how did it survive the reorganization (assuming no other keyblades did), and why is it ornamented as it is in the trailer?
This is where the Birth by Sleep secret movie comes in, particularly the scene that never really made any sense post-BBS. Let's take another look:
So, here's my theory.
The KH that we saw in BBS was an incomplete KH. Not just any KH, though; the KH of the old world. As such, it was kept within MX's keyblade, possibly assisting in its survival and ornamentation. Since KH must coexist with the X-Blade, this KH (that I stress is incomplete) can be more easily related to a hollow shell. Only when the X-Blade is forged will the old KH truly manifest.
So, anticipating that the X-Blade's forging would have completed KH, MX summoned the incomplete KH in BBS as the forging became eminent.
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