Have you looked at DeBoer's actual results? Not the just the record, but the scores. His team's usually play close games, that's what they do. I think part of it is just the hand he was usually dealt, with talent somewhat lacking but basically his games tend to be close. He can beat anyone, but he can lose to anyone as well.
The ability to finish teams off just isn't there. Last year with Washington it was almost all close games, always on the brink. Amazing ability to win mind you, but that does put you in a situation where one bad play and you might lose. I'm not sure he has any other gears than to try to get into shootouts. Obviously that needs to change, and I don't think it's just the OC because it's how Washington operated as well.