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Windows slam shut quickly in the NFL, and these teams need to be aggressive<p>A championship window for an NFL team can be a curious thing. It is usually never long, it is almost never revolving and it can close much quicker than anyone would expect. It can also open unexpectedly, as the Dallas …

Read more at CBS Sports: http://www.cbssports.com/nfl/news/here-are-six-teams-in-win-now-mode-entering-nfl-free-agency-nfl-draft/