OXNARD, Calif. -- The Cowboys were just starting to get healthy and then center Phil Costa hurt his lower back and missed the last 45 minutes of practice Friday afternoon. David Arkin and Harland Gunn moved up the depth chart to get snaps. Costa's status is uncertain, but it comes at a bad time with the Cowboys having just one more practice before the preseason opener at Oakland on Monday night.
*Nose tackle Jay Ratliff got some more snaps in practice Friday after getting -- well sneaking -- in one snap Thursday afternoon. Ratliff (foot) looked pretty good moving around on the field. After he came out, Ratliff had a chat with the trainers to talk about how he's feeling. Ratliff is used to playing with power and quickness and he displayed that Friday.
*Tight end John Phillips didn't practice in pads but did pat-and-go without a helmet in the walkthrough.