Assistant coaches cross back and forth all the time between college and pro jobs. Clyde Christiansen, who graduated from UNC the same year I did and was a backup QB, has coached Brady and Manning in Tampa Bay and Indianapolis and Denver. He was on Mack Brown's staff at UNC last year. Bill O'Brien, HC of BC, was Brady's OC before going to Penn State as HC, to Alabama as OC under Nick Saban, and as HC of the Houston Texans. Theses guys move around all the time. Guys like Nick Saban are the exception and not the rule, and even he spent a year as HC of the Dolphins, a job he did not like nor was good at.