Screens are nothing more than constraint plays; a counter-punch if you will. They are not necessarily a part of a regular offense or even the gameplan. They are called and implemented to keep defenses honest when they begin to cheat towards an offenses tendency and only work when defenses are overplaying in a certain situation.
The difference they have in our scheme compared to others is that we spread defenses horizontally from sideline to sideline as opposed to traditional offenses that stretch them vertically. For example, concerning the Dolphins and Lazor's offense, when defenses load the box on the inside to take away the success of the zone read, we'll run a bubble screen which attacks the boundaries. When defenses try to take aggressively take away our sidelines, we'll run a slip screen which attacks the from the outside in.
It's much more complicated than simply posting the stats when determining the success of screens or constraint plays (draws, QB runs, etc) in general as it's success is determined by offsetting the defense and keeping them honest throughout a series and even game. PFF should simply stick to posting the stats as the screen game and scrap their explanation as it has absolutely nothing to do with how a QB uses them and everything to do with playcalling and how the offense is being played by the defense.
