#2 Bayley
Bayley was a monster on NXT. Her merchandise sales were through the roof and she had won the key children's market, which WWE puts massive stock in. Her arrival to RAW was one of the most anticipated call-ups of recent times, but unfortunately, creative were unable to provide Bayley the platform to demonstrate her considerable talents.
Rather than hot feuds with the likes of Sasha Banks or Nia Jax, she lost more bouts than she won and was on the end of Nia Jax squash jobs way too often for her character to transcend the NXT boundaries and solidify into a top talent on RAW.
I still believe she is a long-term, top draw for the WWE, but they need to move sooner rather than later if they want a John Cena like figure to emerge in the women's division.