Kirk Cousins has been an ironman since he entered the league. He has started all but one game since 2015, making him one of the most reliable quarterbacks in the league. It has allowed the Vikings the luxury of not putting much emphasis on a backup QB. However, my argument on this topic will always remain the same: a player is only an ironman until they aren’t.
Captain Kirk is one bad hit, one mistimed step, one fluky slap to his throwing hand away from no longer being an NFL ironman, especially as he gets older and plays behind one of the worst o-lines in the league.