 The Cowboys improved their defense before the 2005 season, adding DeMarcus Ware, Marcus Spears, Kevin Burnett, and Chris Canty through the draft.Parcells hoped to jumpstart the team's transition from the traditional 4–3 defense, which had been the Cowboys' base defense for the past 20 years, to his preferred 3–4 defense, which he believes favors the talents of the current lineup (speed and athleticism over power).Jerry Jones also added a number of veterans, including nose tackle Jason Ferguson and cornerback Anthony Henry via free agency.