#3 Samoa Joe

The Samoan Submission Machine should already be winning multiple championships in the WWE, but on the main roster, he has yet to win a single title. Joe has lost multiple world title feuds to the point where it's getting ridiculous. Every single time that Joe has looked super hot, WWE has never pulled the trigger on a push.
Despite the fact that his character is good for a heel, the fans always want to cheer him. They even chant "JOE!" repeatedly whenever he comes out. Joe still puts on fantastic matches as he hasn't lost a step despite getting older. We've seen Joe play the tweener role before in past companies which shows that he can be diverse.
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And it doesn't seem like he's going to win any titles as a heel, so maybe a face turn could be the change that Joe needs?
Joe has had matches with most of the babyfaces superstars on the Smackdown roster. We have seen him perform as a heel for years now, so imagine if Joe turned face to go up against Daniel Bryan for the WWE Championship? Apart from the minor encounters that Joe and Bryan have had, we've yet to see them both have an official one on one match in a WWE ring.
Sure, The Destroyer might not be in his prime like he was back in TNA and ROH, but there is still so much left in the tank. He is still speedy and agile considering the fact that he is huge, and there is still a lot that can be done with Samoa Joe.