#4 Luke Gallows
Luke Gallows had his first run with the WWE in the mid-2000's before being released after limited success in 2010. The 34-year-old found a role on Impact Wrestling as a member of the Aces & Eights, however, his career really took off during his run with the Bullet Club in NJPW.
Gallows followed AJ Styles to the WWE back in 2016, however, the wrestler has failed to see the same success as the Phenomenal One. He was able to capture the WWE Raw tag team championship once, however, he and partner Karl Anderson are now often used to put over other teams. The WWE may want to keep Gallows, however, if NJPW is interested, the Superstar will have a tough decision to make.