The NFL is light-years ahead of the other major professional sports leagues in terms of its parity. Football is nothing like the NBA, for example, where only 5-10 teams can consider themselves realistic contenders to win a championship. With that being said, however, every NFL offseason, general managers need to ask themselves a question: Are they a Super Bowl contender and a few pieces away from winning? If so, they should take advantage of the offseason to add key players, usually veterans, who can be plugged in and improve their team immediately.
Conversely, if teams consider themselves to not be in the midst of a title window, they need to become sellers.