Offense could be anyone. They reached into the NCAA for Daboll. They clearly, and rightly, want a creative coach who wants to be multiple.
Defense might be a little easier to pin down presuming they aren't looking to change the focus of the defense too much.
These will be critical hires for McDermotts career. The tree for him to pick from is pretty bare. It's time for him to build his own tree. Doug Peterson just got fired because he couldn't replace John DiFillipo and Frank Reich.