1. Buffalo Bills (3-1)
Previous ranking: 3
Biggest surprise: Defensive dominance
Why it's a surprise: The fact that the Bills' defense is playing well is not surprising, but it's the numbers that the unit has put up that couldn't have been expected. Buffalo has forced three or more turnovers in each of the past three games and has held two opponents scoreless in four games -- including a 40-0 win against Houston on Sunday. No matter the opposing offenses -- the team has faced three backup quarterbacks -- that's a big accomplishment in the NFL. That success has led to a plus-90 scoring margin. The Bills are the fifth team to be plus-80 or better through four games in the past 20 years
11. Kansas City Chiefs (2-2)
Previous ranking: 10
Biggest surprise: Red zone defense
Why it's a surprise: The Chiefs have put much emphasis and many hours on the practice field to improve their defense inside the 20-yard line -- which was worst in the league last season -- but things have only gotten worse. The Chiefs have allowed a touchdown in the red zone 79% of the time, which is fifth worst and two percentage points worse than last season. It's the biggest reason the Chiefs are 31st in points allowed.
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