Does it even matter? Isn't 7 jerseys enough? I'd rather see him win a stage or two instead of hopelessly trying to gain back a couple points.Cavendish is 96pts ahead on 168pts and there are what 5 flat sprints left? And he's faster than Sagan with a better leadout.
Normally 300pts is enough to be sure of green. If Cav is OK through the Alps then he can secure it next week already.