#2 Zack Ryder
Zack Ryder can be labeled as one of the underachievers of the WWE. Despite being one of the most popular superstars, Ryder has failed to win the WWE Championship in his long career. He has continued to be a regular on the promotional events of WWE but has been absent from the WWE Programming.
The Long Island Ice-Z battles on WWE Main Event nowadays which hardly anyone watches. A move to NXT or a return to SmackDown Live can help him become a regular on WWE TV as well. He has the potential to be a solid mid-carder and if given the opportunity can even grow into a top superstar. He could win the NXT North American title and in case you do not know Zack Ryder is one of the few guys to have battled for the NXT championship on a SmackDown episode.