Bellotti has run lots of different offenses with lots of different OC's. They ran a pro-style under Tedford and then transitioned to various versions of spread offenses eventually getting to what they have now with Kelly. From what I can tell Bellotti finds good coordinators that reflect what they can run effectively and he lets them run the offense with his input. What we'd see here would reflect our talent and what we can recruit as well as who he is able to discover next.
I'd love to see Bellotti here with Bryan Harsin, the Boise St. OC, because we can give him a raise and it seems clear that Chris Peterson isn't going anywhere in the near future so he has a better chance of being promoted to HC at Minnesota. Keep in mind, Peterson worked for Bellotti at Oregon before taking over as OC at Boise St. Harsin is only 32 so he probably isn't ready for a HC job now but 5-7 years from now (about how long you'd expect oto have Bellotti around) he'd be probably be ready.