Every player is graded as an individual only. Their abilities are what are reflected by their scores. The cause and effect of having other teammates on the field are not taken into account. What that means is, in a perfect, static, environment, how accurate is Flacco (per your example) at throwing short (<10yds), medium (10-25yds), and deep (25+yds) passes.
Statistics play absolutely no part in any of this. It is all based on the player's individual traits based on what the scouting department that provides the data says. I mention this in the FAQ section of the website as well with another example. The reason for this is because any one of a million factors could affect Flacco's throw or the reception on any given play. That is not a fair measure of traits. They need to be calculated statically. Then, once every ability is graded and accounted for, you throw them all together.
This approach throws production and statistics out of the equation. To quote "that head coach" in New England:
"We are NOT in the business of scouting for PRODUCTION; we are in the business of scouting usable TRAITS".
An example. Joe Flacco. By himself, we know he has a pretty big arm and has some decent accuracy along with some mobility issues. Standing alone in the pocket he can deliver some very nice passes. Now free-blitz 3 LBs at him. Good luck seeing comparable accuracy on those throws. The cause in having three LBs chasing after him caused his accuracy to dip as he was forced to throw on the run. That doesn't mean he is less accurate does it? Of course not. That would be a logical fallacy. What it does mean is that his lack of mobility and ability to throw while evading pressure DOES affect his accuracy.
It is all about causation versus correlation. Sites like PFF don't take into account CAUSATION, but rather, look at mere CORRELATION. There is a big difference as correlation doesn't necessarily suggest causation.
Make sense?

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