... worry about is running back, since they have Frank Gore and selected Glen Coffee in the 2009 NFL Draft.

However, adding an explosive player like CJ Spiller to the offense is a chance that will be very hard to pass up.

Currently, every other mock draft online has the 49ers picking Spiller with one of their two first round picks.

With current running backs Frank Gore and Coffee already on the roster, why would the 49ers even consider adding a third running back?

First of all, running backs take so much punishment throughout the NFL season that injuries at the position occur more often than at any other position.

Plus, if Gore goes down again, would 49er fans be happy with just Coffee as the backup propelled into th...

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