I'm not sure if this is the case, but it seems most pro OC's are on the field
While in college they are almost expected to be in the booth. Just watching the games yesterday and Moore and Bevell were both on the field. I know McDaniels always is and it seems like Shanahan is as well. Those are the only OC's I know off the top of my head, so maybe it's just coincidental, but it seems to be more prevalent in the pro's. I wonder why that is.