UNITY TWP., Pa. — The Pittsburgh Steelers signed free agent cornerback Derrek Thomas and waived/injured cornerback Herb Waters on Thursday. Thomas worked out with the cornerbacks and wore uniform No. 33 during the team’s practice. Thomas, a 6-foot-3, 192-pound corner that played collegiately at Temple and Baylor, was originally singed by the Seattle Seahawks as … Continue reading Steelers Sign CB Derrek Thomas, Waive Injured CB Herb Waters