I don't think coaching gets enough credit, if you check the Islander's charts at Hockeyviz for the last two years they will look like night and day. Here's just one example:
A bad coach tries to hide his weakest links while overly relying on his best players. You see the same thing in youth hockey; (incoming Mighty Ducks reference...) 'close game near the end of the 3rd? Triple shift Adam Banks and sit the other kids so we can win the game'
A good coach leverages every players strength on the roster. e.g. Two years ago Brock Nelson was a fan whipping boy that hadn't lived up to expectations, this past season the 'light' went on. Nah, Trotz just knows how to get the most out of the kid. It's similar to the business world, it's not always about hiring or firing people, it's more about understanding strengths and weaknesses of everyone, and using that knowledge to get the right people working on the right things.
I just hope Ralph is the man...