#3 Kevin Owens

Kevin Owens is another wrestler who has shown how talented he is, he's proven himself to be an amazing heel be it as a badass (as at the beginning of his tenure in WWE) or as cowardly heel (in the latter stages).
There's so much more that the WWE could do with him and they were able to do that when he had joined hands with Chris Jericho and slowly climbed the ladder to become the WWE champion. In many ways that have been the highlight of his career until now.
Before Kevin Owens got injured he was jumped from brands, moved around and in the end was turned into fodder for Braun Strowman's Powerslams which served no benefit to anyone involved.
When he comes back WWE could book him better because Owens really brings out a reaction out of the audience which not many in the locker room are able to do.