#2 Gail Kim
Gail Kim is arguably one of the greatest female wrestlers in history, she sparked what was a revolution in the Knockout's Division in Impact Wrestling and became the first woman added to the TNA Hall of Fame. Even though Kim's name is held highly in female wrestling, she isn't someone that looks upon her time in WWE favorably.
The former Women's Champion made the decision to walk out of the company as part of a live Raw show back in 2011 when she eliminated herself from a Women's Battle Royale and she hasn't looked back since.
Kim retired from wrestling earlier this year and has stated many times that she would only return if it was for TNA, that being said if WWE could find a way to talk Kim into making a one-off appearance then it would truly add something special to the show.