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People making this more difficult than it needs to be. Make Killmonger the new Black Panther, have him go by N'Jadaka going forward and spend the rest of the series with him atoning for his past sins. You can say T'Challa kept him alive, and that while he was recuperating he was stuck in a haze between life and death and was with his father. And after waking up, with the war popping off with Namor and Atlantis, sh*t got so hot there was no choice except letting him help. To keep it all the way 100%, you can have the Wakandas not accept him as King but, accept him begrudgingly as a fighter, with Shuri becoming Queen instead. If Jamie Lannister can fukk his own sister, and push kids off a roof and still be redeemed, they can figure out how to write a redemption arc for MBJ.
No.
One big problem. MBJ can't act.