He may not have the options to. McCarthy has only ever taken over good teams that had cap space and a roster loaded with talent. The one big talent he ever drafted was Aaron Rodgers. But the Packers had good talent all around and loads of cap space.
Moore and Rizzi, we haven't reason to think they can. But like McCarthy, we haven't any reason to believe they can't.
I think the hiring of DC, OC and positional coaches are going to be terribly important. If even one of them are anything less then average it be next to impossible to turn the ship around.