As the new Chargers braintrust tells it to the U-T, they believe in Ryan Mathews. But Tom Telesco also will look to draft or sign another back. This is a smart move--and an obvious one. Mathews, 25, still could be a frontline back. Just two years ago, he ran for 1,091 yards (4.9 per carry). Counting on him, though, would be foolish. He broke two collarbones last year. At this point, consistent returns from Mathews should be viewed as a bonus. Let’s assume the Chargers go the value route and seek a running back after the second round. Can they find someone like Alfred Morris? A sixth-round pick out of Florida Atlantic last year, he ran for 1,613 yards and 13 touchdowns for the Redskins. Or perhaps there’s a hidden gem akin to Arian Foster, who has gone to three Pro Bowls since the Texans signed him as an undrafted free agent. Which back would you like the Chargers to pursue? Which ones should they avoid? Here, following, are three draft-eligible backs singled out by Mike Mayock, NFL Network draft analyst, in his teleconference last Monday. Note that Mayock is willing to voice his skepticism.