#1 Jack Swagger
Jack Swagger is a bit of an anomaly in WWE lore. He was a big, athletic talent who proved himself as a more than competent worker, and benefited from a real life amateur wrestling pedigree.
Indeed, WWE did seem invested in pushing him for certain stints of his tenure, including his initial angle as ECW Champion, and later winning a Money in the Bank contract that he converted into a World Heavyweight Championship reign.
However, Swagger always seemed to find himself shuffled back to the mid-card, the tag team ranks, or ultimately not getting used at all on TV for extended stretches. Swagger has vocalized some of his frustration about how that went down in interviews, citing that his real life skills and size meant he could legitimately take any full time talent in the locker room, and WWE was squandering.
Swagger has since gone on to thrive in smaller wrestling promotions, including a main event push in Lucha Underground. He has also taken steps toward putting his money where his mouth is, entering the world of mixed martial arts via Bellator.
This MMA work adds a new dimension to an already highly credible athlete, and reinforces that Swagger could be a top tier talent for a promotion like AEW.