Yards still don't matter.
Players still aren't making plays. That's not a scheme issue. Missing tackles and losing the LOS isn't a scheme issue. No scheme works when those things happen.
They have more talent and fewer rookies which should make a difference.
Regardless of scheme or what is happening the D is not performing and change needs to be made. Promoting from within the staff is idiotic because it doesn't solve the problem. It just creates chaos.