http://en.wikipedia.org/wiki/Jeff_Casteel
Jeff Casteel has put out good defenses. Not great, but good. The idea that RR teams never play defense is incorrect. While at Michigan, which is what mattered, they didn't. I don't know why Shaffer didn't work. Some say RR was meddling in the defense. The one thing that really pisses me off is that RR was never given what Hoke was given to get coordinators. RR needed a glorified assistant at OC and they still wouldn't give him money to get get a DC. Hoke was pretty much given blank checks and he brings Al Borges. He was given enough money to get an NFL coordinator. The ****** thing is that just as RR was being fired, Casteel got run out and would have been available.
Add on to that RR had his offense set up as far as personnel and I have a hard time believing they wouldn't have been good down the road. Look at 2011. 11-2 team. Now you have a team that won't make a bowl. They didn't go 11-2 because of Hoke. They went 11-2 because there was just enough residual coaching to make the offense somehow do something and a DC that could get them there. People won't believe me on Devin Gardner and that's fine but he would have been a destroyer under RR. Add on to it the skill guys RR was going to get and that offense would have been incredible.