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The run blocking, just as it was last year, has been a really troubling spot for Pittsburgh. The guards haven't done a great job, particularly Ramon Foster on the right side, of opening holes. One guard having a bad day means that the center of the line is fully compromised because the center must help out.
Maurkice Pouncey has done an OK job, but he's been asked to do way too much. Hopefully, once David DeCastro returns to the right guard spot, things will be more simplified.
On the left side, Willie Colon has been a decent blocker but has hurt many drives with penalties.
The tackles have been OK, but they haven't been able to set the edge and keep rushers away from runners.
The pass blocking has been effective, and Ben Roethlisberger has mostly been able to work with a clean pocket. The exception was the second half of the first game in Denver where Roethlisberger was frequently running for his life.
The improvement of this line was expected after a heavy investment during the draft, but the results have been very mixed. Their improvement is key to the running game's success, and ultimately, how well this team does against some of the AFC's tough defenses.