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That’s definitely true. I’m not expert. Just my gut reaction
The other thing that probably matters is PFF's grading system, which essentially scores every play by whether you screwed up or not. Stafford may have slipped in his abilities and be lagging behind some of the more dynamic QB's, but he doesn't screw up very many plays.
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That is a very good point! I didn’t know that’s how they measure
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That's my understanding. They have a bunch of interns watch every snap for every player.
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