Babich, like Frazier are/were just job title holders, this defense hasnt really changed in the Sean era regardless of who the DC is.
Its Seans hand picked coaches and players playing the same form or variation of a Sean designed defense, maybe a few wrinkles here and there but in the end it's the defense Sean wants and what gets played.
The blame game needs to start at the top, these coaches and players were hand picked by the HC to be in his system as that is who he wanted, he needs to be held accountable, everything else is just fodder.