Bigby's strength is playing close to the line of scrimmage and stifling an opponent's rushing attack which is the most likely reason why he was activated for this game over cornerback Al Harris.
The Cowboys boast three running backs that rival any trifecta in the league: Felix Jones, Marion Barber and Tashard Choice. And, with quarterback Tony Romo sidelined, I expect the Cowboys to lean upon their running game.
If quarterback Jon Kitna is expected to have any success throwing the ball against Green Bay's secondary it will have to be set up by a strong ground game. Activating Bigby should go a long way in making sure the Cowboys rushing attack isn't able to get anything going.
Harris, on the other hand, will have to wait another week to make his 2010 debut. With Kitna at quarterback, the Packers have signaled they aren't very worried about Dallas' passing game by activating Bigby over Harris.
Bigby has appeared in 36-of-48 games, starting in 33, since winning the job prior to the 2007 season. When healthy he has played well, recording 10 interceptions, three forced fumbles and 19 passes defended, and has proved to be an intimidating hitter.
Don't expect Bigby to start, but expect him to get around 25 snaps on first and second downs and in obvious running situations. If he can be effective, the Cowboys should have no chance of stealing a victory from the Packers at Lambeau.