#4 Mojo Rawley
Rawley's gimmick as an over-hyped man-child was a little too much for me. It worked well with Zack Ryder due to Ryder's place in the hearts of the WWE Universe. Rawley didn't have many singles feuds in NXT, and once the Hype Bros broke up, he struggled to find his footing.
He did win an Andre the Giant Memorial Battle Royale, but as we have seen with many winners, winning that doesn't necessarily translate into a big push. His win was primarily due to Rob Gronkowski being present for that WrestleMania.
Rawley reappeared in backstage vignettes where he yelled at himself. He also began to wear a fractured pattern of face paint around his eyes and forehead. We were never really given a great explanation for his change in character other than he was unhappy with his past character's failings.
By having Rawley go back to NXT, he can work on his character tendencies as a singles star. It's easy to not have much depth when you are an over-hyped tag team wrestler who seems like he needs to cut back on the sugar. If he does return, he can refresh his character and perhaps get a singles push towards the North American Championship.