Edge
Edge’s retirement day is considered to be one of the saddest days in WWE history. He had the neck issues from 2003 and continued wrestling with that till 2011. It was the stage when not only his career but life was in danger. We saw him relinquishing the title on Smackdown on the day of his retirement. But, prior to that, he relinquished his world title in 2007 and the tag team title in 2009. He’s the one who was troubled by concussions his entire wrestling career.