Why? What have you seen with your eyes that makes you think that? I've seen nothing. I hear what people say, but I haven't seen it.
Grinch coached the Safeties. The Safeties weren't good. He coached at WSU. The D at WSU didn't really appear to suffer after he left. And do we really want a PAC-12 coach coaching defense at OSU? (Don't mistake this for a defense of Greg Schiano.)
I hear people talking about how great Grinch is but I haven't seen it with my own eyes. If he's the best possible choice for DC then I hope we keep him. If he's overrated then I hope Day hires whoever is the best possible choice. It's his legacy at stake and he's putting together a coaching staff for the first time in his life. At Ohio State. Better get it right because if he doesn't get it right then he has no fucking idea how intense the spotlight on him is going to be.