#2 AJ Styles

AJ Styles has set The WWE on fire since making his debut at The Royal Rumble in 2016, but one has to wonder what else there is for The Phenomenal one to accomplish? Furthermore, how many more times can they have Styles defeat a monster opponent and still make it interesting?
Beyond all that, however, is the question of how much longer Styles wants to go on in the WWE. Interestingly enough, there is a rumour that Styles' contract will up at about the same time as The Good Brothers and The Phenomenal one will use that opportunity to officially retire from professional wrestling.
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Of course, that's probably still a long shot, but the company might be able to entice him with a limited work schedule and some more money. In the end, though, Styles has made it known multiple times that he wanted to retire to spend more time with his family and his contract running out is the perfect opportunity to do that.