10. Chris Benoit

"I’m not going to excuse any of the things Chris did outside of wrestling, but when he was in that ring, he was possibly the greatest of all time."
- Kurt Angle
Did you know a top WWE Superstar just wrestled outside the company? More details HERE
Of course Chris Benoit is the wrestler that's mentioned last on this article. Of course he is never going to be inducted to the WWE Hall of Fame. Of course you already knew both.
All controversy aside, Chris Benoit was the man that embodied the spirit of The Dynamite Kid and became a senseless, fearless in ring performer that gave his physical and mental health to the business he loved.
Named the Best Technical Wrestler in 1994, 1995, 2000, 2003 and 2004 by Wrestling Observer, he is considered one of the greatest ever not only by Kurt Angle as aforementioned, but by almost every decorated athlete he ever stood in the ring with.
One could only imagine what legendary status he would have reached and how the wrestling business would have been today if he hadn't done what he did back in 2007.
If two things are certain, it's the huge changes the WWE made to it's Wellness Policy towards the right direction after the horrific incidents, and the unveiling of the sometimes fatal toll that legit head shots took on wrestlers like him through the years.
Information sources: Ten Bell Salute, Wikipedia