I don't know how much the defense's shortcomings are on Dickie, as much as personnel. They brought back players that to fill spots and play important roles when they are clearly old and breaking down. Keisel, Debo and Ike contributed so much over the years, but they were cleanup signings and that goes back to poor drafting and free agent pick-ups.
It seems that the players are not matching DL's defensive philosophy. Its a mess. Troy is done, Jarvis Jones is not a 1st round pick, Mitchell sucks, Cam Thomas is so bad, the others mentioned earlier are servicable, but are old. Not to mention, Cortez Allen's terrible contract. There are so many Band-Aids on this D, they may need to start over. If DL can't draft and sign his type of players, then why is he here? I guess it depends of how much say and influence he really has. If he does have a lot of input and they are still this bad, it may be time to move on.