True but also when you see 6 more penalties or whatever it is for one team, costing say 80 yards more than the other, it tends to show a bias. This is an example and the link shows many of them, but if you are getting called for more penalties and yards for it, you tend to be behind the 8 ball. Hell, how many times will a penalty seem not that big but could push you into a 3rd and long, out of fg range, a td or big play called back etc. I see your point but also the fact having more called against you and not being able to sustain a drive due to phantom hold calls etc do kill momentum and field position too.