Exactly, there aren't that many coaches who can. Arians won with Stanton but that was due to the defense not the offense.
You can't win in the NFL with Jake Locker at QB. Whitehurst is better than Locker but very mediocre, and now they're on to Mettenberg who's a rookie.
Give Whiz a good QB the offense will be good, leave it up to him to find a good QB he probably won't find him.
Arians said in an article recently (I don't have the link, sorry) that he took the AZ job because of a phone call with Whisenhunt where the former coach told him he should take it.