The Bills' defense -- the unit whose improvement helped Mike Pettine earn his first head coaching job in January -- ranked in the top 10 in each of PFF's three categories: run defense, pass rush, and coverage.
The offense and special teams were a much different story.
While the Bills gained the second-most rushing yards of any NFL team last season, they ranked 14th in yards per rush. That could be one reason why PFF's number-crunching left the Bills' ground game ranked 27th and their run blocking ranked 25th.
Those still weren't the worst marks for the Bills' offense. Their passing game ranked 31st, while PFF's Khaled Elsayed added that EJ Manuel was the website's lowest-ranked quarterback in 2013.
Meanwhile, the Bills' special teams ranked 31st, hardly surprising given the struggles of their punting unit throughout the season.
Elsayed's breakdown is just part of the "Offseason Blueprint," which goes in-depth into the Bills' cap situation, draft needs and free-agency strategy.