#4 Kurt Angle returns in Braun Strowman's place and wins
This is an obvious choice, in case Strowman isn't able to compete at TLC. The fact of the matter is that Kurt Angle was sent away on vacation by Stephanie McMahon. She appointed Baron Corbin as the man to lead the brand. But under his reign of terror, ratings have tanked, away from storyline.
Kurt Angle and Baron Corbin have had a feud that has been many months in the making. They have not clashed in a singles match yet and it is only obvious that their tension will build to a boil in a singles environment at TLC. In case Strowman misses the pay-per-view, I cannot imagine a better replacement.
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Vince McMahon could return to appoint Kurt Angle the General Manager of RAW once again. The WWE Universe should be thrilled if this happens.