For guys like us on a message board, it's near impossible to "know" if someone will be good. We lack the true knowledge to assess candidates. I have some different ideas for the way I'd structure my coaching staff but NFL rules make it extremely difficult to make the theory happen.
In theory, I'd hire a veteran coach to be HC. Guys like a Tom Coughlin or a Marty Schottenheimer (big believer in having a Marv Levy type). Experienced guys that can be a figurehead type, brought in to be a general overseer of the team. Level headed when dealing with the media, can provide a solid grounding for the team in terms of man management. Then hire co-ordinators that would have free reign and wouldn't be micro-managed by the HC. With the restrictions on lateral moves, it's not easy to get the guys that I'd want. Normally, a bright OC/DC has to become a HC for them to get a shot at his services.