ESPN has a new metric they’ve developed for the 2018 season that measures pass blockers and pass rushers:
Our new Pass Block Win Rate metric tells us the rate at which linemen can sustain their blocks for 2.5 seconds or longer. Likewise, our Pass Rush Win Rate metric tells us how often a pass-rusher is able to beat his block within 2.5 seconds. Our model of pass blocking harnesses player tracking data from NFL Next Gen Stats.
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Now we finally have objective individual stats for linemen for their most critical tasks -- defending and attacking the passer.