>>718990504
Corax turns traitor.
Traitor turning loyal will be Curze and I'm not even joking or meming. It would be very easy to pull off.
But, if not him, it can easily be clonegrim, Magnus (all shards reformed) or the third Alpha legion brother (the only one left alive). I would say Perty, if he wasn't a daemon prince. Even Angron has some small wriggle room for it.