Tony Romo is sick and not at Cowboys' practice Thursday, but DeMarcus Lawrence (back), Tyrone Crawford (shoulder) and Cedric Thornton (ankle) are in full pads. Tyron Smith (knee, back) and Terrell McClain (ankle) are going through resistance training off to the side. Morris Claiborne (groin) is taking part in early drills but there is no sign of La'el Collins (toe).