#1 Daniel Bryan
The biggest possible surprise entrant in the 2018 Royal Rumble would be Daniel Bryan. WWE will have to make a decision regarding whether or not to clear Bryan for an in-ring return by September when his contract is up or else he'll be leaving and going elsewhere.
Will John Cena beat Ric Flair's record? A former WCW Champion thinks so HERE
From the sounds of it, however, WWE doctors are open-minded to the idea. Bryan's own doctors have cleared him and he has been undergoing new treatments that have shown progress in other brain trauma cases. It sounds as though Bryan and his doctors believe there is no reason he can't return, it's just a matter of convincing WWE's top doctor.
If WWE is going to clear Bryan to return, the Royal Rumble is the perfect time and place for the fans to find out.