The NFL may be more of a passing league now than it was in the 1970s when the Steelers were building a dynasty, but that didn’t mean there weren’t great quarterbacks who could beat a team through the air. To win those four championships, the Steelers had to go through the likes of Ken Stabler, Roger Staubach, Fran Tarkenton, and others. Mel Blount is the main name many fans think of first in that Steelers secondary, but it may have been Donnie Shell, the other Hall of Fame player on the back end, who served as the linchpin for the Steelers.