A weakness of the K-Gun was the ability to get it them off the field quickly. Lots of very short drives when things weren't clicking. The Bills also punted from mid-field or even inside the Giants territory multiple times. This Bills team is the best in the league at converting on 3rd down, and going for it on 4th to extend drives.
Also, Jim was calling his own plays and didn't have Brian Dabol in his ear making adjustments. Jim was great, but he didn't have the help that Josh has.
Against a 1-15 team...