7Ken Shamrock
Source:bloodyelbow.com
Ken Shamrock fought during the Attitude Era, and he left WWE in 1999. According to the sources, the WWE holds a grudge towards Shamrock, and even though two sides have tried to work out a deal, WWE didn’t show interest to bring him back. He decided to start a career in UFC, but he managed to stain his UFC legacy with a losing streak which was just embarrassing.
