Jack Sanborn is a mediocre white linebacker, Kyler Gordon is a below average nickel he's the Justin Jones of nickelbacks, Darnell Wright is at best another guard who gets completely overwhelmed by average pass rushers, Tyrique Stevenson has been CONSISTENTLY burned in pass coverage to the point that teams don't bother with Jaylon Johnson, and rookie DTs have been huge disappointments. Dexter hasn't registered one big play a sack a tackle for a loss or a big play in the run game. Pickens has.5 sack and 1 stuff.
The Bears defense is again among the worst defenses in the NFL in forcing turnovers for the second year under Eberflus. They completely revamped the defense and they're still amongst the worst in pass pressure turnovers and they're still amongst the worst in the NFL in third down percentage on defense.
Yeah they've been better against the run of late but they're overall a very bad defense at all four levels and all of the numbers support that.