As head coach and offensive coordinator, CPJ of course, has many coaches working/coaching under him.....so what is his role more precisely? How much instruction does he give, particularly to the offense? How does he do it w/o overriding other coach instruction? Does he supplement their instruction or is he ever the primary coach for any position/group or approach?
From the various press conferences and radio shows CPJ has said or indicated that he:
He works directly with the QB, whether on the practice field on in meeting room where they review the film of the prior game. He said the QB/BB coach probably has the toughest job in the film review since CPJ is usually in the room (the other position coaches generally get to do their review without CPJ being there).
He also develops the game plan for the next week. He receives a lot of input from the staff, including new play ideas, but the offensive game plan is his baby from what I can tell. He noted one time that when an offensive staff assistant coach brings him an idea for a new play he will look it over and ask what to do if the defense counters the play in a certain way. If the assistant coach can't answer the question satisfactory, he sends them back to the drawing board.
He throws in his two cents (probably much more) with respect to the defensive game plan when he feels it necessary. He generally keeps out of the DC's hair, but certainly he is not shy about giving direction if he thinks the defense is off track.
I don't think I've heard him say much about working the WR or the OL. He rarely mentions the WR except to talk about a specific player or a specific (highlight reel) play. He says more about the OL, though I don't recall him saying much about working with those players and he rarely talks about the OL coaches. The comments are usually more along the lines of wanting the players to execute better, difficulties blocking the mike linebacker, the line's performance in general, etc.
All the practices (Spring, Fall, in-season, bowl) have to be organized and I'm sure he is involved in that.
That is just the coaching side. He as a truckload of stuff to do that is not coaching related. He has to check up on academic performance, deal with issues such as a player skipping class, talk with the players parents, meet with the Athletic Association staff about a number of issue (e.g., facilities, NCAA requirements, schedules, etc), be involved with recruiting, and whatever else he has responsibility for. He has administrative staff support of all of this, of course, but he still has to provide input and ensure that that the non-coaching aspects of the football program are being handled appropriately.
One more thing, he also has to deal with his personal favorite group - the media.