This is pretty much it.
Something weird happened in February of that year onward. And you can see it statistically.
A great possession team should generate PPs and should have their opponents on the back seat. And this was true for the first 50 games of that year. But we ended up home and cooled out for the President's Trophy very early on, our playing style generated a lot of negative press, and the media in markets jealous of our success (Toronto, Edmonton, Calgary) really ran with that negative image.
And the PPs stopped. Every single night, for the last 30 games of that season and into the playoffs, we were dominating possession, dominating games ... and the other team was handed a PP advantage. Mugging the Sedins became the status quo and was never called. Constant rinky-dink calls against us.
We were a good enough team to deal with it and keep winning for a long time. When injuries hit against Boston, it was too much.