What happened: Dallas added Mike Pettine as a senior defensive assistant to support the defensive coordinator. Pettine previously served as Jets defensive coordinator with Rex Ryan calling plays.

Why it matters: The move targets situational play-calling and play sequencing on defense. Dallas framed the addition as a necessary reinforcement for its current staff.

What to watch: How Dallas divides game-day duties between Pettine and the coordinator comes into focus this week.