We like to think we can predict things with some degree of accuracy, in every fantasy arena. But there are always exceptions that prove what a guessing game we're involved in, none more so than the 2015 Buffalo Bills defense.

The Bills racked up a league-best 111 sacks in the 2013-2014 seasons, finishing 2nd and 1st in sacks in those two years. They then hired Rex Ryan as their head coach, and he'd come off overseeing a Jets pass rush that ranked 6th the previous season. Gold!

But Buffalo crashed heavily in 2015, finishing with a mere 21 sacks -- better than only Atlanta. Mario Williams is handed a lot of the blame, but he's just one guy. Clearly there were defensive scheme fit problems with other Bills players.

At the other end of the spectrum were a pair of AFC North teams: Pittsburgh, which ranked 25th and 26th in sacks in 2013-2014. Last year they zoomed up to 48, 3rd in the league. And Cincinnati, last in sacks a year ago and 9th last season.

Three-year sack trends, by NFL rank, for each team are shown in the table below. They're sorted by the biggest increase (or decline) from 2014 to 2015.

TEAM SACKS, 2013-2015, NFL RANK
Team201320142015+/-
Cincinnati10329-10+23
Pittsburgh25-27263+23
Oakland18-1930-3114-16+16
Houston29-30195+14
New England513-152+11
Denver13-159-121+8
Tampa Bay23-2422-2314-16+8
Carolina113-156+7
Washington21-2220-2114-16+6
San Diego23-242924+5
Tennessee21-2216-1812-13+4
Dallas25-272825-27+3
Seattle8-920-2117-19+3
Green Bay8-99-127-8+2
St. Louis313-1511+2
Minnesota13-159-127-8+2
Kansas City6-754+1
New Orleans42525-270
Atlanta29-3030-3132-1
Cleveland16-172728-1
Detroit2889-10-1
Arizona6-72420-21-3
Chicago31-3216-1822-23-6
NY Jets13-156-712-13-6
San Francisco18-1922-2329-7
Miami11-1216-1825-27-9
Indianapolis11-129-1222-23-13
Jacksonville31-326-720-21-14
Baltimore16-172-317-19-15
Philadelphia202-317-19-15
NY Giants25-27430-26
Buffalo2131-30

--Andy Richardson