The guy who stands near the head coach on game days and makes sure the team doesn't inch and inch and inch closer to the field. And is always behind the necessary lines. The guy who is always screaming......."GET BACK" waving their arms pretending to push the team back to tell the players, get back or else we are about to get a stupid warning or penalty.
Best job in sports! GET BACK GUY! Every team in every level of football has one.
Another might be a guy who is in charge of the 2-pt conversion chart. Before each series he tells the head coach, if we score one or two. Like after the opening kickoff, before the first snap, he gets on the head-set and tells the coach..."go for one". And does that before EVERY offensive possesion starts.
They are guys who are related to real coaches and team executives who can't get a H.S. coaching gig so they tag along for a while building up their resumes - not a bad idea if you want to get into the business
Quality Control in training, practices etc. really relates to statistical frequencies, timing, tempo...stuff like that. If guys are doing certain things too often, they can be slowed down, changed up or alternated.