\He also has 10 games where he looks like total dogsh!t, and that costs the team wins.
I think you're overstating that a bit. Off the top of my head, for this past season, I can only think of the dreadful performance against the Isles. I don't count his bad games during the playoffs, given that he was playing with an injury that, if it had been the regular season, could have kept him out for two weeks to a month. 2010-2011 I consider an anomoly for the entire team.
He also consistently has the most minutes on any given night, a tall task for a forward. You'd expect losses to fall on him more often, almost as a tautology. I could be convinced otherwise though if you can take a forward with comparable ice-time and a comparable supporting cast that costs his team wins.