I truly believe that if the D-staff had been retained either a} NU would have had a couple of B12 championships and a NC or b} Callahan's ego and Pelini would have gone DEFCON-1
This is what impresses me about this staff - keeping quality staff members who have proven they are competent. What will really impress me would be if (and I really hope it doesn't happen) one of the assistant coaches after a couple of years for whatever reason cannot produce results, and Pelini fires him. Devaney did it, promoting TO up to OC. TO did it, hiring McBride as DC. Solich did it his last year, but wasn't given a chance (probably should have done it earlier). Callahan didn't and should have.
Ouch! Imagine canning your brother.