#1 AJ Styles
Again, not many people know this but AJ Styles used to be a member of the WWE's roster as a jobber before he decided to leave and pursue greener pastures. Those pastures brought AJ to TNA where he became a star that shined brighter than any other in the promotion.
He would win the TNA World Heavyweight Championship and enjoy a superb run in the company until disagreements with management saw him depart for the Far East to New Japan Pro Wrestling and Bullet Club, where he instantly became the IWGP World Heavyweight Champion.
After that, he finally returned to the place it all began when the WWE made him an offer he couldn't refuse. From there, he has become WWE Champion to complete his return to the pinnacle of professional wrestling.