That 84 Team was wild. The defense held opponents under 10 pts, 7 times. Every win, including the playoff win against WAS, the defense allowed 14 or less. In every loss, they allowed 20 or more.
So they were 11-0 allowing 14 or less and 0-7 when allowing 20 or more for the season (including playoffs)
What is even crazier is that followed a season where they went 7-0 when allowing 19 or less in 1983, and then followed it up with the 85 team that went 16-0 in those games. Check out how good Dikta's teams were when they allowed 19 or less:
7-0 in 1983
11-0 in 1984
16-0 in 1985
13-0 in 1986
7-1 in 1987 (NO 19-17) Strike season - Bears blew a 17-3 halftime lead.
13-0 in 1988
5-1 in 1989 (GB 14-13) - Bears blew 13-7 lead in 4th quarter.
10-1 in 1990 (WAS 10-9) - Bears blew 9-0 halftime lead.
82-3 when holding opponents to 19 or less from 1983-1990 and led in all 85 of those games. Wow.
The team was also highly dependent on McMahon's health. Fuller was the only QB to lose in 1985 and 1986 regular seasons. McMahon was 17-0, Tomczak was 6-0, Flutie was 1-0, Fuller was 4-3. McMahon was 36-5 as a starter from 84-88 but missed so many games.
Putting those two together, from 83-88, McMahon never lost a game when the Bears defense allowed 19 or less.
In an odd mirror to that, Fields has never won a game when his defense has allowed 21 pts or more, he is 0-22 in those games.