He also couldn't. We could play with hypothetical situations all day. And what does "win" mean? Cause we do have 9 of them. Are you saying a good coach would add wins? Which ones? Is it possible that this fictional good/perfect (from what I've come to assume here good = perfect) coach could lose some games too? I mean....is Mangini the first coach to lose games he "shouldn't?" Isn't that part of the whole parity in the NFL thing?
Thing is, how many teams' message board fans are actually happy with their coach? Doesn't seem like too many. Maybe Belichick, Fox, Tomlin and Fisher and a few others. How many good coaches are out there? I don't think Mangini is particularly good, but I don't know how much worse he is than average.
