#4 The AJ Styles factor
WWE had to send AJ Styles home in the middle of the SmackDown roster's tour of South America. The reports given at the time said he was dealing with an illness but whatever he was stricken with couldn't have been too bad because WWE called on "The Phenomenal One" to fill in for "The Eater Of Worlds" at TLC.
The Raw writers found out later in the week they might need to do some replacing and had plenty of ideas of who could fill in for Bray Wyatt. The sad part of course is we might never know what they had planned in regards to the evolving Sister Abagail storyline, but depending on who you ask, that might not be a bad thing.
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Fans have been waiting for a match between Finn Balor and AJ Styles for years and it's finally going to happen at TLC with no televised build-up. But WWE might let Styles and Balor pull out all the stops in this match between two former members of The Bullet Club as well which makes this idea even more exciting.