While the sudden David DeCastro news caught everybody off guard, the Pittsburgh Steelers were fortunate to at least have an option like Trai Turner available to step in. DeCastro had an MRI during minicamp that revealed he would need surgery on his ankle, and the team subsequently released him as he now contemplates his future.
Turner is a former Pro Bowler himself, but like many veterans who are in a similar stage in their careers, injuries have grown to be an issue. That is part of the reason that he was available, of course, when he was, as well as for the price.