Agreed on the last part, but the individual metrics are created from the same data that is taken from individually graded plays. Play side, dropback depth, throw depth, time to throw, etc. I suppose this might be considered the metadata of the play.
PFF info is out there with some research you can find out more about their process.
For example on the graphic we're discussing it tells us right on it that the QB ranking vs Pressure and Bltiz comes from Passer Rating. And we know that Passer Rating isn't one of their metrics so they're not going to use it build a cumulative overall metric.
Also, I agree that PFF grade charting records a lot of information during the scout style per play grade. But it doesn't mean the other information is part of individual per play grade.
One metric that some have a hard time understanding for example is time to throw. Time to throw is not part of PFF 'overall grade' but it is a useful piece of information. Its not a good or bad metric it merely tells you how long a QB takes from snap to throw. Its not a value judgement metric.
For some of the metrics they can combine the select metadata and play grade for things like Turnover Worthy Throw %, Adjusted Completion %, etc.
Although they
can it doesn't mean they do, like in the examples of passer rating vs pressure/blitz or time to throw.
Adjusted completion % is merely a QBs completion % with batted passes, dropped passes and throw-aways removed.
Turnover worthy throws is an interesting metric and its on area i'm not surprised Watson is high in.
Watson has always made risky throws, even dating back to college. You don't get to be league lead in TDs by being a shy thrower.
Like I was saying in earlier if i'm OB its not an area I necessarily try to reign in. I believe once you ask a QB to dial it back its hard to get them to later on be aggressive.
However, I would like to see throws like the would have been INT in the Browns game that Hopkins broke up and the INT he threw just before the half time a few games ago.
I think you can reduce those risky throws while still maintaining an aggressive throwing mentality. We want to keep the back shoulder throw to Griffen in the endzone while cutting down on some of the INTs mentioned earlier.
I think its more interesting to discuss what PFFs individual metrics are actually telling us then speculating on what is imho their least meaningful metric (overall).
