Plain and simple most of those couldn’t be developed into game changers in my opinion. They were bad draft choices. I believe we maxed out the potential those guys had. Three of those guys don’t play in the NFL anymore and I would say in another 3-4 years neither will the rest of them.
So a GM that was around sine 2000 and put together one of the best defenses for almost a decade all of a sudden forgot how to draft defensive players and almost every one of them was a bust vs a coach that has overseen a team for 11 years and the defense has only gotten worse cannot develop players. Which one seems more plausible?