User blog comment:Crimson Storm Mich/Future Units Preview v2/@comment-27498603-20160922033354/@comment-30040673-20160922213157

Not all omnis are alternate realities but this can only be said for units that are global exclusive as Azurai's omni is his form when he led the charge against Mikael's brother and the form he's trying to take during the end of the the Eneroth GQ. As for other exclusives, it's usually just a continuation of their lore.