Theory 1 is that Mario and kyle have hit the wall. Also, AW has been out all year. That's 1/4 of the D. Also, only shwartz made the D elite. With many of the same players Pettine had the D in the top 10 on paper but they were horrific against the run under Pettine. Wanny with a young Mario and kyle had many of the same players playing to a historically bad level, giving up over 1200 yards in two games at one point.