[Schefter] Lions free-agents: CB Carlton Davis, G Zeitler, DT Onwuzurike, LB Derrick Barnes, DE Davenport, WR Tim Patrick, OT Dan Skipper, DE Muhammad, CB Vildor, DE O'Connor, LB Niemann, DB Melifonwu, WR Allen Robinson, LB Zeke Turner, CB Dorsey, CB Emmanuel Mosley, DL Cominsky, DL Jonah Williams