Yes, I am not arguing he beats Sora in the present, I am saying Sora has no way to live past his past self getting ee'd given his lack of aca type 1 or something resembling it, sure he can resist EE on the informational and conceptual level, but that doesn't cover historical/timeline EE.
1)Flight, movement, and a lot of other stuff in general, require time and space to function, something the battlefield would no longer have after this
2)If this is for the 2-B ends, sure
If this is for the 2-A ones, however, to my knowledge of KH it doesn't have above baseline 2-A range so those places would still get caught up in the cosmology nuke so it doesn't matter