The only problem is that they will likely promote from within. I know there can be quality replacements in house, but generally if you have a bad staff you need to get a new person with an outside perspective who has been successful. We're basically still using the people from that Miami tree who never performed well. The only reason our defense was okay last year is that we were a top 3 offense.
I'm still putting my vote in for Nolan or Marinelli. Looks like Rod will be a Bear and I doubt the Packers are willing to bring in someone like Nolan who will want some control over personnel on the defensive side.