FOOTBALL OUTSIDERS: Football analysis and NFL stats for the Moneyball era - Authors of Pro Football Prospectus 2007
Dockery, as much as we can deduce from these numbers (i.e. not much) is doing unspectacular. There is no gaping hole on the Bills line, and it's strongest hole in run blocking is running inside the right tackle-guard hole. Can't really credit Dockery for that.
He's playing next to one of the most respected LTs in the game, so I was actually expecting more from their OL numbers, but it's not really Dockery's fault persay. It's someone's fault on the Bills though, be it Marshawn Lynch or whoever.