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There are all sorts of theories regarding why the Cowboys’ running game was so poor in 2012, and there are probably all sorts of legitimate answers as well.
Perhaps the primary reason, though, was the loss of tight end Martellus Bennett. Although he was widely considered a “knucklehead” (for lack of a better term), Bennett was one of the best blocking tight ends in the NFL. In his last three years in Dallas, I tracked the ‘Boys as totaling 5.5, 5.4 and 5.9 yards-per-carry, respectively, when running behind Bennett.
Those numbers were significantly higher than when rushing with Jason Witten at the point.
In Dion Sims, the Cowboys would land a tight end who can immediately help in the running game. He's 6'6", 262 pounds and shocked many with a 4.68 40-yard dash and 35-inch vertical. That's great explosiveness for someone Sims' size, and it points to potential upside as a receiver.
Dallas likes what it has in second-year tight end James Hanna, but Sims would represent a major upgrade over Hanna as a blocker.