True, but there are minor things that additional "coaches" can provide, much like spotters in NASCAR. You could have someone who does nothing but analyze the other team's plays & formations in-game (i.e. they're dropping a safety each time we run Play X or we are potentially exposed when they run Play Y). You could have someone that is strictly monitoring clock and timeout situations. You could have someone that watches the broadcast and reports anything of note to one of the assistant coaches. That would have been helpful in the 2014 NFCCG when the announcers pointed out Sherman's wounded wing to the viewing world, yet the Packers staff never realized it.
I've always thought that for the millions of dollars the Packers clear, they could have a room full of pimple-faced kids that are paid $40k each to scrutinize fringe areas of the game and report it up the chain of command throughout the game. That doesn't get too many cooks in the kitchen, just additional information in the hands of decision makers.
