Among the issues the Chicago Bears had last season, the dysfunction-fueled struggles of the offense naturally garner the most attention. But the defense, former head coach Matt Eberflus' "specialty", was at best mediocre and just bad in some capacities.
Dennis Allen has not been a great head coach, but he is undoubtedly one of the top defensive minds in the NFL, which is why Ben Johnson wanted him to be the Bears' defensive coordinator.
Allen brings a different mode of operation to the Bears' defense than the one Eberflus favored, which is undeniably a good thing.