I stopped looking at PFF years ago when, in the middle of an argument with Clay about Houston vs Dumervil, I analyzed their pass rush ratings and realized that they have a negative correlation with winning, while real-world pass rush productivity has a positive correlation with winning (obviously).
I don't really think they know what they're grading, they just rate the guys that they like highly.
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With a sack in 61% of his games, SB MVP Von Miller is the most consistent pass rusher in NFL history.
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