This is basically it.. when you're a blitz heavy team like the Bills, you're relying on a few high level man coverage guys and just praying you make it to the QB. Whenever a guy is blitzing, that means he's not covering a WR/TE/RB and if the QB can identify that quickly, they will gash you all day long
Remember a couple years ago when the Bills blitzed Brady on like 90% of their defensive plays (forgot percentage exactly, but Brady had mentioned it in his post game conference and the stats reflected it as well), it was something absurd, and Brady I don't think got sacked a single time that game.. He just recognized the blitz, tossed the ball to that area of the field that was absent X number of defenders and got huge yardage
As funny as this may sound, people should play Madden on the All-Pro or All-Madden difficulty and try blitzing every single down... its just a game, but the strategy, etc gets pretty deep these days in that game (deeper than I can even handle, and when I was younger I was a Madden master) and its obviously not real football, but it actually helps you understand the offensive and defensive concepts a lot better.. On the high difficulty settings, it will give you a nice virtual simulation on what happens when you blitz every play lol