#3. Killian Dain

Killian Dain has had some terrible luck on the WWE main roster. When he was in NXT with Sanity, he was a part of one of wrestling's hottest factions and the group of four showed an immense amount of potential, with fans assuming that their dominance would translate to the main roster.
Unfortunately, that didn't happen at all and Sanity was completely wasted from the get-go. We're not exactly sure why that happened, but Vince McMahon clearly wasn't as big a fan of Sanity as Triple H was.
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Either way, the Superstar Shake-up completely dissolved Sanity, with Eric Young set to have a singles run, while Nikki Cross tries to make her name on RAW.
As for Killian Dain and Alexander Wolfe, it looks like they're going to be sent to NXT: UK, where they can actually be utilized and made to help other talent on the roster.