#2 Nigel McGuinness
Nigel McGuinness is possibly the greatest professional wrestler to ever come out of the United Kingdom. The English-born wrestler is one of the true legends of the business, having been a regular on the indie circuits for 13 years before retiring in 2011. His matches with Daniel Bryan are the stuff of legends!
He did his best work with Ring of Honor but also had a stint in TNA as well as various other smaller indie promotions. He never made it to the WWE during his time, though, and it remains one of his biggest regrets.
He does have some measure of a consolation now, though, as he has signed on with the company as a commentator, having previously worked for 5 years a commentator for ROH between 2011 and 2016.