@cplach Hargrave can play both DE and NT, and we also picked up Mathews from the Chargers. Both are vast improvements over Cam Thomas and Cliff Geathers. As for RB I agree that we're going to need some depth there, maybe rounds 3-5.
Summary: Casey Matthews has long hair and plays linebacker. Other than that he does not compare favorably to his older brother Clay, which is unfortunate for him when it comes to getting selected early in the 2011 NFL Draft. He is a high-effort player though and can stick around by contributing on special teams if nothing else.
Player Comparison: Zach Thomas. Like Thomas, Matthews was not blessed with overwhelming athletic ability or size. They both compensate by studying the game and getting into position to make plays rather than using elite speed to make up for being in the wrong position.