By Chris Herring After all this time, perhaps many of us simply forgot. The Bucks led the NBA in defensive efficiency during the 2018–19 season, then earned the distinction again in 2019–20. After a dropoff to ninth-best during the 2020–21 regular season, Milwaukee clamped down when it mattered most, not only finishing with the league’s stoutest defense last postseason, but also winning the club’s first NBA championship in 50 years. So, this season, with the Bucks falling to a pedestrian 14th in defensive efficiency—and ranking just 19th since January 1—it might have been fair to wonder whethe…