#3 Roman Reigns
I know what you're thinking, Roman Reigns is currently battling leukemia and taking advantage of his time away from the ring, but there could be a way for him to return and not have to wrestle.
If Corbin is unable to win his match against Strowman at TLC this weekend then he will lose his job as the Authority figure of Monday Night Raw which means that WWE will need someone to take his place.
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The best thing after a heel General Manager is a face and the pop that Reigns would receive if he was given the chance to become the Authority figure on Raw would definitely be worth it. He could even name a second in command so that he wouldn't have to be at Monday Night Raw every week which would give him much more freedom.