The story of the Tampa Bay Buccaneers' defense in 2016 is a memorable one, very neatly divided right down the middle. Through their first eight games (weeks 1-9 of the season), the Buccaneers allowed 29.0 points per contest, fourth-worst in the NFL. Through their final eight games (weeks 10-17), the Bucs surrendered 17.1 points per game, fourth-best in the league. Turnarounds don't come much more dramatic, or more symmetrical than that.
The generous (and quite possible) reading of that divide is that it took a couple months for Buccaneer players to fully grasp and become comfortable in the system installed by their new defensive coordinator, Mike Smith.