No, you can't say that about every position, because you aren't controlling a RB, LB or S at all times. Every time you pass the ball you are in control of the QB. A RB may miss a block or run the wrong route and a LB or S may blow a coverage, take a bad angle or be in the wrong gap.
That won't work, if I'm playing with my back up QB and there's a rookie corner who's the week link in the secondary due to his lack of awareness, I should be able to at least pick up him. He shouldn't be smarter because my back up is in the game.