#3 Corbin's stable is able to defeat Braun Strowman
Let's assume for a minute now that Strowman is able to compete at TLC. But at the same time, he isn't able to go long because of his rather legitimate injury.
WWE may decide to book an angle where Lashley and McIntyre help Corbin to defeat Strowman. This could build heat for a future payoff.
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Will this mean that Corbin will retain power going forward? Yes, it does.
But it also allows someone like Balor or Ziggler to step up and put an end to Corbin in the weeks that follow. Wrestling is a fight-themed soap opera, and one must remember that the key is to keep storylines going for as long as potentially possible. This could be a pit stop with a payoff at the Royal Rumble pay-per-view.