#4 Muscle buster
Samoa Joe is a monster. However, he does not currently possess a monstrous finisher that gives him a three count. The Samoan Submission machine has a coquina clutch, but that does not always give him a win.
But in NXT, Joe used muscle buster - a move where Joe places an opponent's neck on his shoulder, and falls back. However, owing to an unfortunate accident while performing the move on Tyson Kidd, Kidd's wrestling career came to an end. Kidd believes his hands were in the wrong position while taking that move.
Kidd survived the accident, and is producing amazing matches in WWE as a backstage staff. However, due to the severity of the incident, muscle buster was immediately banned. Even though Samoa Joe teased using it on various occasions, he has never performed the move again.
Similar to Seth Rollins and the curb stomp, bringing the muscle buster back may be the one thing Joe needs to take him back to the main event scene.