#6. Alexa Bliss
WWE has a very strict policy on concussions. If one of their superstars is to suffer a concussion, he or she won't be cleared for an in-ring return until they are declared fit by the doctors.
Alexa Bliss, along with Mickie James, was scheduled to battle the team of Trish Stratus and Lita at WWE Evolution. However, due to her suffering "multiple concussions" during a house show, she had to pull back from the event. Alicia Fox replaced Bliss for the match.
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There were even rumors that Bliss' in-ring career might be over, but the former RAW and Smackdown Women's Champion shot them down.
On the latest episode of RAW, Bliss was given administrative duty, implying she would not be returning anytime soon. But the Goddess has not given up on her return yet and has started her training at the WWE Performance Center earlier this week.