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I know I'm cheating since I did say five people most responsible, and the offensive line is five people, but since there is certainly more blame to go around, I'm including the whole unit as one.
This Cowboys line has been utterly dreadful this year. Sure, Tony Romo has made some boneheaded decisions, and it has been difficult for Dallas to run the ball since DeMarco Murray has been out for most of the season and Felix Jones is as reliable as an 88 Yugo, but the offensive line can't block in either aspect of the offense.
Let's look at the running game first, where the Cowboys are only averaging 78,7 yards per game on the ground after an awful rushing performance where they ran for only 35 yards as a team and had to abandon the run in the second half after falling behind early.
That number is bad enough on its own, but is also accompanied by a team average of 3.5 yards per carry, which isn't bad, but not great either.
When the running game isn't working (or is abandoned, but we will get to the blame for that), the passing game is used more. Here is where Dallas' offensive line play has been the most defensive.
Tony Romo has been sacked 26 times this season. Again, this doesn't completely excuse his poor play, but how do you have the time to make a good decision when your offensive line is failing you?
Bad line play usually begets a bad offense. Dallas is lucky in the sense that it has the talent to make up for it, but that talent can only do so much when there's no time for them to work.