#2 A.J. Styles

A.J. Styles is the best wrestler in the entire world, and it isn't even close.
He consistently gets loud and positive reactions, is a very very good promo, and can have a good match with anybody.
He can also lay claim to being the most accomplished singles star of the last three years; he has been a featured part of the WWE ever since his debut and has held the WWE World Heavyweight Championship twice. Indeed, his second reign was more than a year and included a successful title defence at WrestleMania.
Smackdown Live is indeed the house that A.J. Styles built, but apart from facing Randy Orton, Styles has done everything he could possibly do on the blue brand.
Moreover, Monday Night Raw's main-event scene has had a major vacuum ever since Roman Reigns was forced to relinquish the Universal Championship.
A.J. Styles certainly has the required star-power to fill that void.
We already know that Styles and Lesnar would be a good match; they tore the house down at Survivor Series 2017.
But this time, what if Styles actually won?
It would make for an unforgettable WrestleMania main event.