In 2008, most teams gave up blitzing Edwards (Adrian Wilson aside, ha, ha) because he performed well against the blitz in the early run, and the Bills went on many the scoring drive. Then opponents went to max zone coverage schemes, and Edwards/Schonert were nonplussed. Actually, Edwards was only sacked on 6% of his pass drops throughout the year. The problem was that the receivers could not beat the coverage. Well, James Hardly didn't even perform to the wretched Peerless Price heights, Reed and the tight ends were either injured, invisible or both. Evans was essentially rendered a non-factor, and only Bong Mode and Fred saw some light.
This year TO is supposed to obviate the Hardy void, and, unless I'm mistaken, Shawn Nelson is being groomed to replace James altogether, and Reed and the Dereks are healthy (so far). Steve Johnson may add to the mix. Maybe even Parrish will find a way to contribute on offense. So opposing defenses may not be able to take away Edward's receivers.
On the other hand, the Bills offensive line is beyond sketchy, until proven otherwise. Defensive coordinators are essentially compelled to test the Bills ability to pass protect. The ball is in Kugler's court IMO, and Devil Belichick, Ryan and Sparano probably have trouble keeping the smiles off their faces.