In the NFL, nothing happens in a vacuum. And free agency is no exception.
A flurry of activity by an NFL team can turn them from pretender to contender in the blink of an eye. The reverse can be true as well. Start hemorrhaging talent, and today's Super Bowl contender can be tomorrow's also-ran.
Free agency can do more than just shake up the pecking order in division races around the league. The first round of the NFL draft can change completely as team's fill holes and their needs change. And the biggest deals made in one year set the bar for negotiations in the next.