xwalker
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Player development depends in large part on player acquisition anyway. Whether you improve the personnel by developing them or replacing them, it's still personnel that's at the center of this. Not play calling, which only changed in reaction to their performance.
Bringing it back to the OP that said Martin was the MVP. It appears based on the improvement from the 1st half of 2013 to the 2nd half that the Cowboys were already on their way to a drastic improvement in rushing before Martin was added.