#2: Daniel Bryan gets disqualified but retains
This, along with the next possibility, are the two most likely outcomes in the match between AJ Styles and Daniel Bryan at TLC, at least as I'm predicting things. Bryan hasn't shied away from using underhanded tactics in order to win and retain his title recently.
Even though he beat Styles for the title, he attacked Styles after the bell and cemented his heel turn. He's repeatedly attacked Styles whenever the two have confronted each other. When he has attacked Styles, he's brutalized the Phenomenal One with kicks to the body and face as well as utilizing leg locks.
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There might come a time in the match where Bryan feels like he isn't going to win and he might resort to another low blow or the use of a weapon. Should he get caught, Styles would win via disqualification.
Since Styles technically won the match, he could petition for yet another title match that could potentially go down at the Royal Rumble. Bryan could still gloat that he has the belt and Styles will be furious while waiting for the potential match in January.