Complacency is fatal in the NFL. The best teams constantly capitalize on available opportunities.
The New England Patriots are the league's greatest dynasty because of two constants: quarterback Tom Brady's sustained excellence and head coach Bill Belichick's willingness to exploit inefficiencies, especially in the trade market.
Over the years, the Patriots either acquired or traded away the likes of Drew Bledsoe, Corey Dillon, Randy Moss, Deion Branch, Richard Seymour, Wes Welker, Aqib Talib, Jamie Collins, Jimmy Garoppolo and Josh Gordon. Not all of the moves worked in New England's favor, but that isn't the point.