Barry was extremely too slow is making adjustments last year and I read that early and often. I understand that he has the fear of over adjusting and opening up what they schemed to stop all week, but there is a chess game with calling plays and I feel like Barry either doesn't mentally get the chess game, or he's calling plays scared.
Yes, if the defense adjusts to the offense, the offense will then adjust and maybe go back more towards what you originally game planned to stop... but you as a play caller, need to take some risks, and stop what the offense is currently doing, and maybe take some educated guesses of when they might be adjusting to something else.
That being said, I felt like there was some type of feud going on between Barry and the defensive players... as reporters suggested they were openly talking to media suggesting they need a change. And this only increased with the Packers DB coach leaving and sounded like DB coach and Barry had disagreements and it sounded like the DBs were being the most vocal on the Barry issue (though DBs are usually the most vocal in general).
Also, I'm not totally sure what changed, other than some reports the defensive players finally got Barry to listen and simplify things, to just let the players think less, and go full speed more, but the defensive front seem to pick up after losing Gary and Lowry. Also seemed like Reed was at DT more and Clark at NT more. Also some weaker OL opponents helped, but it was clearly more than just that.
I'm wondering how much infighting or disagreements lead to the Packers defensive struggles last year.