Chicago’s defense was awesome in 2018, leading the NFL in points allowed, turnovers forced, touchdowns scored, and passer rating against. They also finished third in yards and sacks and were generally the best defense in the NFL by a wide margin. Their play propelled the Bears to a 12-4 finish, NFC North title, and the franchise’s first playoff berth in eight years.
It’s hard to expect much improvement from that unit in 2019. In fact, they’re almost certainly not going to repeat that level of dominance. So when I write that I expect the Bears to improve in 2019 and be one of the top Super Bowl contenders, that must mean I expect it to happen because of the offense.