Running back battles to watch during training camp: Part 2.
Here are some of the key questions: Can Maurice Jones-Drew carry the load for a full season as a featured back? Is this the year Reggie Bush breaks out? Or will he lose goal-line touches to Pierre Thomas? Who will back up the brittle Brian Westbrook and will they have an impact this season? Frank Gore wore down last season; what will the Niners do to preserve him this time around? Will anyone step up as a credible threat from the backfield in Seattle?