Ahh, I didn't know the cobble stage was so early. Might still play a role for Nibali, because he is the best cobble rider of all the GC contenders by far, and he might really go hard for the race lead there.

There have been changes to the green jersey competition that I just saw, and the new scoring system will now favor stage winners more than consistent riders, so the days of Sagan winning the jersey without winning any stages are likely over. This should really favor Cavendish, a pure sprinter who will win a lot of stages.

Changes to Tour de France green jersey classification confirmed | Cyclingnews.com