>>47578488>headcanonThe original dragon is irrelevant to the story, it's the same as the beasts who died in the Burned tower's fire. An event happened, the dragon split because of the wills of the two brothers.
Guess what, you and N are a re-run of the two brothers and just as they saw both sides eventually, leading to Reshiram/Zekrom turning to their orb forms, when you two showed up they revived, to seek the champion that would stand by them. Truth won out - N realised the folly of his dreams of separating humans and pokémon, after realising they were meant to share a symbiotic relationship and that his foster father was a power-hungry mentally unstable retard.