Wow.
Dilfer was the starting QB for the Baltimore Ravens, but I'd hardly say he "won" a championship for 'em. I give the guy credit for not making the kind of boneheaded mistakes that kill drives and limit scoring opportunities (like Rob Johnson did frequently), but that Ravens team won w/ a defense that was one of the best defenses I've seen (outside of the '76 Stillers and the '85 Bears, I don't think there was any better than the '00 Ravens). And the "Bledsoe did not" theory? Well, I guess the Bills did have the 3rd ranked total defense that year. Looking a bit closer @ the numbers though tells a different story:
Points allowed: 350, 18th in the league (the Ravens allowed a league record low of 165)
Turnover differential: +6, 10th in the league (Ravens had a league best of +23)
So the Bills were only the 10th best in the turnover department while they were in the bottom half in points allowed that year. Comparing the defenses is quite hasty.