Why? The defense listens to one and not the other? The defense hasn't played particularly well for him this year. Pretty much middle of the pack if not second half of defenses in the league.
In my mind EVERYONE has underacheived. For that the responsibility should fall on the top guy, but if we just elevate the coordinator when after his unit underachieved what's the point.
As Jim Valvano used to say, "If he knew all the answers why didn't he tell me."