#3 Aleister Black

Aleister Black, like Ricochet, was brought to the main roster at the start of the year, and like Ricochet, he had a great start to his main roster career. But, WWE seem to not have anything for him creatively, which, sort of, derailed his push.
Black was moved to SmackDown after the Superstar Shake-Up, before being brought back to the Red brand during the WWE Draft. He is currently in a feud with Buddy Murphy, whom he will face at TLC.
Look who just shut down all of Tony Khan's critics! More HERE.
But - with all due respect to Murphy - Black needs to be feuding with someone of a higher calibre, and one that can advance his WWE career... like Seth Rollins. The former NXT Champion is a delight to watch in the ring and his dark persona could go well with the loudmouth personality that Rollins is portraying right now.
Black needs to get his main roster career back on track as he's being wasted on RAW at the moment. This feud could very well help him as well as Rollins heading into WrestleMania season.