I think Marcus Freeman would even concede that Kelly is the better OC.
Coach Day can recruit (Chip Kelly's biggest weakness), and Chip Kelly can coach offensive football, develop offensive talent, and lead/run a system better than most in the business.
Another example of ND playing checkers while OSU is playing chess. And it shows in the comparative success of these two programs since the turn of the century.
I think ND could have done worse than Denbrock, so a lot of this comes down to timing as well. I'm just tired of our competitors making all the exciting moves, while we (Notre Dame) hire a dinosaur to run our offense who doesn't bring anything as a recruiter and who has a really unique career-arch that makes you wonder how much of his late success is just good luck vs his actual ability to coordinate an offense (referring to Denbrock of course).