When the Patriots and Dolphins square off Thursday night, it will continue to shine a spotlight on the remarkable stability in New England. Just consider the AFC East, and the perpetual coaching toll of competing with the Patriots. Since the Patriots hired Bill Belichick in January 2000, the other three AFC East teams have combined to change head coaches a remarkable 21 times -- that's almost 1.5 new coaches per season. In fact, just this calendar year alone, the AFC East teams have all switched head coaches.  And with the news this week that the Lions fired offensive coordinator Joe Lombardi and replaced him with quarterbacks coach Jim Bob Cooter, it was a reminder that since the start of the 2012 season, only one NFL team has had the exact same head coach, offensive coordinator and defensive coordinator: the unbeaten Patriots. Every other team in the league has made, and continues to make, changes -- often radical ones. Sometimes they work. Since the Dolphins...