It shouldn't be a surprise to anyone that Chip Kelly signed two very good running backs this offseason for a reason. Based on Kelly's perception of value, Murray would seem to be the workhorse, but it wouldn't surprise us in the least if Mathews is favored at the goal line. Kelly is all about minimizing risk, and while Murray's fumble total has risen steadily over the years, Mathews' has declined. It could be as simple as a coach using the numbers at hand to form a logical theory about when and where Murray is best fit to carry. That way, both running backs stay happy. -- Conor Orr