Teams weren’t prepared for how good Allen actually was last season as a passer and didnn’t run the appropriate coverages. This year they are and are defending solely against his passing game. Basically, they’ve figured out the Bills strengths and their weaknesses (poor run game, scheme that de-emphasizes the run, and a QB intent on pushing it down the field and who loses patience easily). It’s amazing how many passes he forces into coverage with medium deep throws once he gets on the other side of the field (which seems like most drives). They stall a lot on the other side of the field because he doesn’t take what defenses give him and instead does long-developing pass plays that result in pressure, sacks, and incompletions due to shell coverage with seven DBs. The Bills offensive problems against teams that are half decent seem to be in that range between the opponents’ 25 and 45 yard lines.