As for me, I remember way back earlier in Reach forums when people were discussing the time travel theory: A theory that linked the Halo 3 legendary ending to him possibly traveling back in to planet reach during the fall.
[Edited on 10.05.2012 8:25 PM PDT]
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You brought back horrible memories of the Kingdom Hearts community back in the day. It doesn't get much weirder than that. The worst part is that some of those things aren't far fetched in the universe.