... statistical analysis (similar to our 2009 Player Grades ) which could be used to determine the worth of one player over another.  For example, how much better would the Cowboys be if Felix Jones played every snap at running back (disregarding fatigue)?  How costly would an injury to Jason Witten be?  Essentially, how much does each player contribute to a win?

This task is easier said than done (and since it isn’t even particularly easily said, it sure isn’t easy to do).  As the reader points out, one would have to “normalize” the conditions outside of the player to ...

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