#9 Austin Aries
Austin Aries is an immensely talented professional wrestler. There's no doubt about that...well, unless you're WWE apparently.
In NXT, Aries was somewhat lost in the shuffle. Sure, he was a big name, but so were Bobby Roode, Samoa Joe, and Shinsuke Nakamura. It's easy to see why guys like Aries, Roderick Strong, and Kassius Ohno fell by the wayside when the already-stacked roster kept adding more significant layers. And I'm sure that it didn't help that he suffered a serious orbital bone fracture just four months after he finally turned heel.
When Aries finally debuted on the main roster, it was as a commentator for 205 Live, so WWE fans knew that this would be his home when he was cleared to compete. When he did return, he was immediately thrust into the Cruiserweight Title picture and seemed poised to be the one to conquer Neville.
He wasn't. He lost at two consecutive pay-per-views then got released.
Some suggest that he was released because he was frustrated with his role on 205 Live, others suggest that WWE officials thought he was difficult to work with. Whatever the reason may be, Austin Aries' four-month stint on the main roster was almost entirely disappointing.