I have 3 issues with Barry as the DC hire:
(1) He's a nepotism hire who has a track record of poor results as a DC.
(2) He hasn't shown much ability to adjust his scheme to fit his players, which is how you capitalize on their strengths and innovate.
(3) For that matter, he's bad at adjustments, period. Especially in-game. He goes into a game with a plan and sticks with it, even if it doesn't work or the other team has figured out how to counter it. Exhibit A: Atlanta game. Sure didn't seem like they did much adjusting to stop the run in the 4Q. When a rookie is toting the rock all day at 6.5 yards a clip, you need to do something about it.