When longtime coordinators move from one defense to another, it's noteworthy.
There were several such transfers for this season, including former head coaches Romeo Crennel, back to Houston, and Mike Pettine, now in Green Bay. Dean Pees, as successful as nearly any assistant coach over the past two decades, landed in Tennessee.
Here are six intriguing new defensive coordinators:
Romeo Crennel, Houston — If there was a Hall of Fame for coordinators, Crennel would have the credentials for first-ballot entry.
He replaces new Titans coach Mike Vrabel in a job Crennel held from 2014-16, pretty much when J.