Jason Babin's fall from the ranks of the elite sack-masters to just another pass-rusher is not unprecedented in the league. It's not even unprecedented in Philadelphia.
Since sacks became an official NFL statistic in 1982, a player has registered 18 or more of them in a season 21 times. That includes Babin and two other players who did so last season (bold in the list below).
Other than the following season being one shortened because of a work stoppage (w) or a player being injured (i), the biggest one-year sack dropoffs of those belong to Tim Harris (who went from 19.5 in 1989 to just seven in 1990) and the Eagles' Clyde Simmons (19 in 1992, five in 1993).
Simmons' dropoff is easily explained as all-timer Reggie White (who owns three of the 18-sack seasons himself) moved on to Green Bay following the 1992 season, and opposing teams had one less monument to block, making it easier for them to key on Simmons.
Now, it appears that Babin will have a chance of bettering his 2012 sack total (5.5) in Jacksonville.
Players with 18 or more sacks in a season and how they fared the next year: