#1. The Rock
Although it may sound wrong, if The Rock ever does return to the ring, he "owes" Bray Wyatt one. It's hard to forget their WrestleMania 32 interaction four years ago. It was in front of the largest wrestling audience ever and while Wyatt was originally scheduled to face (and presumably lose to) Brock Lesnar, he wasn't on any match and was used instead to confront The Rock.
During the segment, it was evident that Wyatt's popularity was through the roof but the night ended as most major nights did during that run - with his back against the canvas and face towards the ceiling.
Charlotte Flair to return and wrestle a CURRENT CHAMPION?
It was another instance of his momentum being derailed. He turned face just a night later, but an injury changed those plans. We know that The Rock said he "quietly retired" from wrestling, but in this industry and with WWE, you can never say never.
If The Rock were to return, we would understand WWE wanting to put him up against someone like Roman Reigns - but facing The Fiend would make a lot of storyline sense as well.