For me 2009 demonstrated the value of pff grades.
KC had an OL graded at the bottom of the league. RB Larry Johnson was graded far above his production.
When charles became the starter, KC ol instantly springboarded to the top of the run block rankings.
The bad running game was not larry Johnson's fault. The run blocking was too bad. When charles played they instantly started blocking great and charles reaped the rewards. That's the narrative PFF grades would give you, and it's obviously bullshit..
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