On my boat they all work together and the A/B is in charge. I issue orders to him and he makes sure they get done. If they don't I go to him and he gets the talking to. If everything gets done, they all get an attaboy.
The A/B has more knowledge and gets a few extra rights and privileges and he is also the one that gets the beatings until morale improves. Everybody has an open line of communication to me but they better use their chain of command first to solve because they know once it gets to me, I am going to solve the problem in the way it benefits me most.
Well, not really on that last one but that is what I tell the crew and that seems to keep the problems that get to my level to a minimum.