I've got to say, Doom potentially being the hero makes sense. Though I doubt it.

T'Challa? Makes plenty of sense; out of all the Illuminati, he has lost the most.
Even Namor would almost work, but be problematic as hell.

Reed though? It'd be unearned. A total story failure. Despite being the "smartest guy in the room." He has lost the least. He is the least emotionally invested. Even Tony has lost more than him.