I am conflicted about Norv being the HC. I like Norv. He is a tremendous X's and O's coach. He is not an inspiring leader and I think his ability to handle a staff is suspect. In Oakland and in Washington he handled the offense and the DC handled the defense. That in my opinion is not a good arrangement. Obviously, he will have a leaning one way or another but he needs to be involved heavily with both sides.
I'm also not sure if his style of offense is best for Romo. He doesn't have a rocket arm, his motion is a little long, and he is better out of the pocket. None of that lends itself to Norv's timing based offense. Besides we didn't bring in Garrett for nothing.
I say let Garrett learn on the job. Allow him to pick his own assistants especially his coordinators. He is smart, allow him to figure this out. I think he knows his strengths and weaknesses enough to cover them. Its better than a retread looking over his shoulder waiting for Jerry to can him in favor of Garrett. Jason Garrett leader of the Dallas Cowboys organization. If he fails - he fails, but let's do it right.