ESPN tracks the play of whole offensive lines and individuals by what they call the pass block and run block win rates. This is how often they deem that a blocker wins a snap against the defender that they are tasked with blocking. While they do not show the ratings for the OL guys in the entire league, they do show the best by groupings (offensive tackles and interior offensive linemen). After week five every starting offensive lineman for the Denver Broncos shows up in at least one of the top lists.
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Alex Palczewski is currently 6th best among OTs with a PBWR of 95% and Garett Bolles is currently 10th with a PBWR of 94%.