#4 Kurt Angle
Kurt Angle replacing Braun Strowman to face Baron Corbin at TLC makes perfect sense storyline-wise. Angle was sent on vacation by Stephanie McMahon and Corbin was given the reins of RAW.
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Perhaps TLC could be the PPV where Angle returns, admonishing Corbin for doing a terrible job of being GM of RAW. There has been a rivalry between the two for a while, but we haven't seen the two battle it out in the ring (except for the time when Angle eliminated Corbin from the World Cup qualifying match in a tight-hugging, golden suit as El Conquistador).
Angle returned to a WWE ring at last year's TLC PPV when he replaced Roman Reigns, who was down with an illness, to face off against The Miz, Cesaro, Sheamus, Braun Strowman, and Kane, while he teamed up with the remaining members of The Shield, Dean Ambrose and Seth Rollins.