Pittsburgh's O-line fallback plan

Dominant offensive line play hasn't exactly been a hallmark of the Pittsburgh Steelers' performance over the past several years, and QB Ben Roethlisberger is celebrated as much for his ability to create plays when he's hassled in the pocket as he is for plays when everything runs smoothly. As the 2013 season looms, the Steelers are poised to push forward with two young players at the bookend spots on the O-line in Mike Adams and Marcus Gilbert. But what happens if one of them is injured or proves inept?