#4: AJ Styles Regains his title
AJ winning back his title would be both cathartic for him and the fans. He didn't lose in in what can be considered clean fashion, which stinks for a guy who has carried the Blue Brand for most of the last two years. He deserved better, but it got Bryan where he needed to be with his heel turn.
AJ and Bryan are the two best wrestlers the brand has to offer, so just seeing the two of them in a WWE ring for a WWE Championship is partially reward enough. If AJ does win at TLC, he'll likely do so in clean fashion. He's still a face and wouldn't likely resort to drastic measures - yet.
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AJ showed us how he'll respond when pushed over the edge like he was in his feud with Samoa Joe. Since I mentioned that I have Bryan retaining, I also have this as not as likely to happen as some of the other potential finishes.
AJ is also slated for a brief hiatus before Wrestlemania next year, so him winning back the title only to have to lose it again seems counterproductive.