Penalties

you cannot say, in 9 out of 10 circumstances, that a player lost out on yardage or was denied the stats of a big play, because it was "called back" from a penalty.

Most of the time, the big run or big pass is made possible by the penalty. I read today that Blount had 59 add'l yards that were taken away because of holds. Holds on running plays = not possible to get the yards without the hold.