There are a few concerns I have.
1. Will Collins hire a really good coordinator? I get the impression that Collins doesn't want to be outshined. He, to me, seems like the type threatened to have really good talent, as coaches.
2. What coordinators would want to work under Collins? Face it, coordinators learn under the leadership of a head coach. I feel the coordinators would do the teaching. See #1.
3. Will Collins take over the defense? Basically, pull a Dan Quinn. How will that effect the game management, that he struggles with now.