The problem with that, is Kail took over his own body when he transferred. This means that there can't be two of the same people in the same timeline.@Traveler_Shu - That theory might be true. Remember that he didn't really go into the past but a different branching timeline. So the hornless demon lord in his original time line might have been another Kail from a different branching timeline trying to fix whatever event he wanted fixed from his past. All in all, just confusing as shiite! 😁
And Back to the Future was the only story to pull that off. Despite it being the dumbest form of time travel.I prefer the single malleable timeline, since it doesn't require endless universes appearing out of nothing.