The Bills’ offense remains one of the best in the NFL, but their defense has struggled. They rank just 13th in opponent EPA per play and 26th in defensive DVOA. Bills fans should be scared of this year’s version of the Chiefs, which has been far better by almost every metric than they were when they went 15-2 last season. Their offense is better than it’s been in years, including ranking fifth in DVOA and fourth in EPA per play, but they are also better than the Bills defensively.