#2 Family reunion
The Wyatt Family made their main roster debut in 2013. The original members of the faction were Bray Wyatt, Luke Harper, and Eric Rowan.
At one point in time, a certain Daniel Bryan was also a member of the faction. Former member Rowan has already sided with the American Dragon as his intellectual peer. There have been rumors ongoing about the possible return of Bray Wyatt for The Greatest Show Of Them All.
The Eater Of Worlds was last seen on WWE programming as one half of the Deleter of Worlds tag team also involving "Woken" Matt Hardy. After an injury to Hardy, creative wrote Wyatt out of TV programming and he has been missing in action since.
Kofi Kingston has the numbers advantage, with Big E and Xavier Woods on his side. So, Bray Wyatt reappearing and helping Daniel Bryan retain the WWE championship can be a possibility.