#4. Ruby Riott

Ruby Riott has been seen as the leader of The Riott Squad ever since the trio were moved up to the main roster back in 2017, but back in April WWE seemingly disbanded the squad when Liv Morgan was moved over to SmackDown Live.
Sarah Logan has since appeared as a singles star on Monday Night Raw, but Ruby Riott is yet to appear since The Superstar Shakeup because she underwent shoulder surgery to repair a bilateral injury back in April. Riott's surgery was successful but she was then required to have another surgery on her left shoulder as well.
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According to a report from Fightful Select, it appears that even though initial reports suggested that the injury would keep Riott out of action indefinitely, she could be eyeing a return around the time of the 2020 Royal Rumble.