#4 Daniel Bryan

Daniel Bryan's shocking WWE Championship win was just what the doctor ordered, both for him and the title. It was a shot in the arm that made the title far more relevant than it had been in AJ Styles' lengthy reign. For the first time in a while, there's a lot of buzz surrounding it. Styles did a fine job, but it was more than time for a change.
Daniel Bryan increased the buzz with his bizarre (in a good way) promo last week and his absence this week. AJ Styles certainly wasn't pleased. The two will have a rematch at TLC in what should be an excellent contest, but the Phenomenal One is unlikely to win.
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It will be an open question as to who can dethrone the fallen Daniel Bryan. The Royal Rumble will certainly be a lot more interesting with him holding the WWE Championship.