#2 Alexa Bliss
When Alexa Bliss joined the main roster as a part of the 2016 Brand Extension, few could've expected the massive success she'd have.
Never holding the NXT Women's Championship, Bliss proved all her doubters wrong at TLC 2016, winning her first of five Women's titles on the main roster.
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But over the past month, Bliss has been pulled from all matches and hasn't competed, either on TV or at WWE Live events for several weeks. The report going around is that Bliss is dealing with concussions, something that the company has fortunately taken a lot more serious over the past decade.
It seems the WWE do have backup plans in case the worst happens, with the rumor going around that Bliss will replace Baron Corbin as RAW GM after TLC, similar to Paige becoming SmackDown GM in April.
Hopefully, though, this won't be the case, and Bliss will return to the ring when the time is right.