What won the super bowl and playoffs for Philly after Wentz went down, was scoring, and play calling to the strength fo your players. Foles is not the pocket passer Wentz is. So when Wentz went down, they changed the offense to a read option, to help Foles do what he does best. Reading defenses and reacting to what he sees.
Losing their best player on D and their franchise QB would derail most teams. The Eagles showed that coaching can have a positive effect in the face of adversity.
unfortunately, we don't have that coaching. no change no matter what...but, that's another thread for another time. Hoping Bell is gone next year.