Being a quarterback in the NFL comes with quite a bit of responsibility, and it also requires having a thick skin. They are usually the most loved by their respective fans, although not without criticism for their mistakes. But they are also the most hated by the other 31 teams, especially if they are successful. Their lifespan in the league, with few exceptions, is very short. The league’s most valuable player award almost every year goes to a quarterback. Journeyman quarterbacks who aren’t ready to ride off into the sunset, try to sign on with teams as a backup and more often than not are re…