#2 Replace the match with a multi-man tag team match
At this point, one option WWE could go with if Braun Strowman can't compete tonight is to replace the match with a multi-man tag team match.
WWE could book Corbin to team up with Bobby Lashley and Drew McIntyre and have them face Finn Balor, Elias and a third WWE RAW Superstar.
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The big question here will be as to who will be the third person in the team opposing Corbin. Obviously, it makes the most sense to put Kurt Angle there. Angle is scheduled to appear on the WWE RAW after TLC so he may already be scheduled to be backstage at TLC later tonight.
WWE can keep Angle's identity a secret when they announce the 6-man tag match and keep Angle as a surprise entrant.
The only problem with this scenario, and a major one, is that the Elias vs Lashley and Balor vs McIntyre matches will be off the card, which may leave it looking a little light.