Last year, the brakes were the weak point for the Mercs. They apparently got that solved. This year it seems to be the clutch. I don't know what Ferrari and Williams were doing the past two races that they might not be able to do from Spa forward. But if those two teams have found something that Mercedes hasn't, we might have a real dogfight on our hands through the end of the season - especially on tracks that are harder to pass on.