I'm not sure I follow.You mean like Yurcich?
I never said ALL assistants stay several years. That never happens at any program, ever. But the core of their staff has remained in place for 4-5+ years now.
Yurcich was a passing game coordinator for one year at OSU before taking a promo to be an OC at a blue blood program. And even at OSU, he wasn't calling the plays. He was the QB coach, but Ryan Day was very much the guy running the show on offense.