I've wondered about that staff now as well. Ohio State has arguably the best coaching staff on the country, if not top 5. Their co-offensive coordinators are former head coaches, of their co-defensive coordinators, one is a former HC and the other has been one of the hottest up and coming defensive guys for the last couple years.
Having someone like Meyer allows coaches to check their egos and be a part of something bigger because they know another opportunity will come from it. Much like with Saban at Alabama. But will all of those guys be ok with Day? Does Grinch take the Oklahoma DC gig? Do any of the assistants get plucked from another team? Guys like Larry Johnson and Tony Alford are outstanding position coaches and would be coveted elsewhere.
I think Kevin Wilson stays as OC. Those guys coordinated the 2nd ranked offense in the country together and have similar philosophies. I also expect Schiano to stick around. From what I've heard, Schiano really helped Day during the interim role early this season and he's a guy with a lot of experience to sort of help Day along. Not to mention Day doesn't have a defensive background and Schiano is a respected defensive mind. The Buckeyes had their struggles at times this year, but I think Schiano is a good DC. I wouldn't be surprised if Grinch went somewhere else. If not this year then definitely next year. I can't see he and Schiano sharing duties for long.