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#2 Revenge for The Undertaker
This is a popular theory because Roman Reigns was the guy who allegedly retired Kane's brother The Undertaker at WrestleMania 33.
Since Kane returned during a match with Roman Reigns and attacked The Big Dog, it might only be logical Kane hat a target on Reigns' huge Samoan back.
Kane could have returned in order to avenge his brother's defeat at the Show Of Shows in Orlando.
After all, Kane and The Undertaker might have been at war plenty of times during their careers but kayfabe blood runs thicker than water in WWE. Kane's insertion into the TLC main event might be another reminder of the enemies Roman Reigns has created along the way.
Seeing how Kane will have four other partners for the match at TLC, it will also give him ample protection in case he's still got some ring rust on him.
