First, this defense was better than last year's defense. Second, Rees made halftime adjustments. It frustrated me that he always waited until halftime, but he made them then and they worked. Sheridan did not make halftime adjustments in any of the 4 losses this year. You ran the same plays all game long to no effect.
The other team practices, too. They are coached, too. If they have a plan to stop what you are running, you have to adjust to what you are seeing. Coordinators who cannot do this fail no matter where they go or who they coach.