Their defense was not suspect. Who did they lose? Zadarius Smith? He didn't play all season anyway.
I guess you're right:
SOURCE:
2021 NFL Opposition & Defensive Statistics | Pro-Football-Reference.com
15th in yards per play allowed (5.4)
14th in points allowed (371)
9th in yards given up (5579)
32nd being worst in all categories. Pretty ho-hum.
Bears FTW:
12th in yards per play allowed (5.3)
22nd in points allowed (407)
6th in yards given up (5384)
Interesting that Bears gave up so few total yards...possibly because opponents got a lot of short fields due to dogshit offense perhaps??
This site didn't dive beyond a tenth of a point for yards/play and there was a tight grouping, or that might be a better measure or overall defensive play vs. being put in shit situations by Nagy's offensive offense.