Dan Fouts
Fouts remains one of the greatest quarterbacks in Chargers franchise history. Like Dan Marino, he never won a Super Bowl but everybody acknowledges his brilliance. However, the Hall of Famer arguably played for too long as the team and his body declined (via L.A. Times).
He played a full season for the final time in 1981 but didn’t retire for another six seasons. Furthermore, his numbers dropped each year after this. This isn’t surprising as he aged and suffered more injuries. Another issue was that the Chargers failed to refresh the roster during his time with the team.