We are only talking here about which guy is better in pass defense, not who is the better overall player. I didn’t say PFF REC % is the ONLY stat for this purpose. I said it is the best. It is.You can reject PFF scoring if you like but your method is not the only way to judge performance. Of course there are stats built into these PFF scores so to assume they aren't is misguided. YAC wouldn't be a stat used to evaluate CBs. Things like PBUs, INTs, tackles, sacks, etc. are absolutely part of those scores and then some. What PFF and your stats only method don't account for are things like leadership and attitude, which I would argue are almost as important.
Riq is graded 54% which is excellent, and Spoon is graded 71%, which is poor. Yet they score about the same on “coverage” stat. Why? What’s the difference between a -1 and a -2 coverage score on a play? I assume if you allow the reception and then miss the tackle you get a lower score than if you immediately tackle the guy to prevent the first down. That’s how YAC allowed might explain their different grades on REC% vs. “coverage” scores….but PFF is somewhat vague about what they include in “coverage” beyond REC%.
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