... Marion Barber and David Buehler as people over which to worry .  On the other hand, he thinks Doug Free and Alan Ball will be fine.

We'd actually reverse this.  While there is certainly a lot of confidence in Free and Ball, the Cowboys must at least be somewhat worried about whether the two players' inexperience will come back to bite them.  On the flip side, the effect of Barber's potential decline is weakened by the presence of Felix Jones and Tashard Choice, i.e. Barber's play matters less than that of Free or Ball.  Furthermore, ...

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