Chargers' expectations for Mathews

Since the San Diego Chargers elected to use a first-round pick on Fresno St. RB Ryan Mathews back in 2011, he's -- for the most part -- failed to become the kind of do-everything back that some had projected. This offseason, the team re-signed veteran Ronnie Brown, and added ex-Patriot Danny Woodhead to the mix, a sign to some that the team would be scaling back Mathews' role and responsibilities for 2013, the penultimate season on his rookie pact. But is that a realistic viewpoint?