Like I said, pressure, sacks, knock downs, hurries, all those things, are not easy to place the responsibility on.
Remember those times in Schaub's early years when we sometimes complained that he didn't recognized the free Blitzer coming off the edge (actually the Blitzer can come from anywhere).
Oftentimes, we're not even sure whether that guy was the responsibility of the blocker or the QB.
....
But here, at the very least, we have to prorate the number of pressure (be it a sack or a knock down) to the number of attempts.
Everything being equal, a QB that throws the ball 207 times will see more "raw" number of pressure than a QB that throws the ball 150 times.