If you look at the successful coaches in the FBS they all seemed to have moved up through the ranks staying at the college level having served at low-paying roles as “graduate assistants” and “analysts” to get started rather than getting established in the HS coaching ranks. That said, having a guy who knows Utah HS football from the inside might be great for recruiting, assuming he’s respected by the other HS coaches and not despised for his success (I don’t know in this case). As you said he seems to know QB development well, hopefully his methods will translate to FBS College level — there are things you can get away with in HS that won’t fly in FBS due to speed, complexity, and talent in the FBS college defenses.