Resurgent
both need to be put down a peg and lysandra will prob win with rebecca buying enough time i think for asher to fully transform into the next devourer. I think with raziel's transformation was needed for the bloodline of drakaris if that is how u spell his name, and the same for asher but with the potential of both light and darkness or angel and demon potential. being the strongest hunter and the fastest rising demon nearly the strongest almost, this transformation will be a boost in both power and ability since we will likely be able to use radiant mana. this is all my opinion take it with a grain of salt everyone.
Resurgent:Asher can never become the next devourer because he didn't get Drakaris' bloodforce.
If the two of them knew what Asher did to their sons I feel like they would unite to try and destroy him lol. Though I can see Rebecca "winning" because Lysandra winning puts what she thinks is her son at risk. And while before she couldn't throw the fight because Drakar was there, with Rebecca this could be the chance she needs to withdraw and plausibly not kill Asher.