When execution repeatedly doesn't occur, when the same plays are missed, when the same mistakes are made game after game, and season after season, it is a coaching problem. It's been said several times in this thread, the offense-side of ISU football is continually disorganized and mistake-prone. It's night and day difference between the defense and offense.
My point is, the OC isn’t in charge of everything on the offense. He is in charge of implementing the game plan and play calling. Changing the OC won’t magically make the WR run the right route or make the RB hit the right hole or cause the QB to not hit a wide open WR. They were in positions to make plays today and didn’t. The whole offensive coaching staff didn’t prepare them well enough, this isn’t all on the OC.