Donovan McNabb trade, winning percentage

I've noticed that many of the articles announcing the trade of Donovan McNabb to the Washington Redskins state that McNabb has the third highest winning percentage among NFL QB's behind Tom Brady and Peyton Manning. I believe that's a mistake. Brady has the highest winning percentage in the NFL, followed by Ben Roethlisberger (60-26 regular season - 70%, a little higher if one includes his postseason record).

Pittsburgh Steelers 2010 preseason schedule

Week 1: Detroit Lions
Week 2: at New York Giants
Week 3: at Denver Broncos (National TV, FOX)
Week 4: Carolina Panthers