Within five months of the arrival of new Dallas Cowboys defensive coordinator Christian Parker, optimism has emerged that a struggling defense may be on the brink of major improvement. "We know we've got a long way to go to be able to compete and to do the things we know we can do as a unit, but we have a whole defensive staff who's hungry, who want to win and know how to win," defensive tackle Quinnen Williams said. Cornerback Reddy Steward said Parker has already made an impact.