#4 Nikki Cross
Yes, she's on SmackDown. Yes, she's already done the faction thing with SAnitY. Yes, she's still, technically, in a team with Alexa Bliss. But, this is wrestling and this is WWE, so who gives a haggis? Nikki Cross would be perfect in this new faction.
As part of SAnitY in NXT, Cross wasn't just the only woman in the group - she was the mad dog enforcer of the team. Imagine Arn Anderson, but with rabies. Actually, that's a little disturbing, don't do that. Cross, though, was a force of nature, not caring who got in her way, as long as it wasn't one of her faction mates. She was gleefully out of her mind.
Corey Graves deleted his Tweet! More details HERE.
Her time on the main roster hasn't exactly been the same. She's had plenty of success, mind you. She's had a run with the WWE Women's Tag Team Championship with Bliss, and she's had a number of matches for the SmackDown Women's Championship. So, she's done fairly OK for herself on the Blue Brand. But, she hasn't been... well, she hasn't been Nikki Cross.
It would be amazing to see Rollins siccing her on his enemies - male and female alike - knowing that an unhinged Cross could put terror in the heart of anybody if they saw her rushing towards them. It would also get her on television as part of a major angle, and that's always a plus. Plus, imagine if, for some reason, Rollins would have to send Cross after his fiancee, Becky Lynch.