He has paid a little more to offense this season with things like "run the ball more" but that is about it. But throughout his career he has been known as "hands off' with respect to the offense. When he said it would be monitoring it offense more carefully this year, there were posts on the board of "finally"..."he needs to take over the offense, too." You are the first person I have heard say he meddles too much in offense. The game plan, play calling, etc. is the offense's staff, i.e. Cumbie's responsibility. Obviously GP has always asked questions and tried to assist, and makes calls such as go for it on 4th down, go for 2 or 1 after a TD. But 99% is the offensive staff. As always. GP calls the defensive calls, and no, Cumbie does not interfere with that.
Oh, and the world is round, too.