Cav will just head butt Sagan in the first sprint, sure, he'll get relegated, but he'll have him intimidated for the rest of the sprint finishes.

All joking aside, the thing that I see that is different is that Sagan really hasn't faced anyone that was close to as fast as him so far this yr and coming off the wall at the sprint a couple of days ago in the TdS aside he doesn't seem ready to be as rough in the melee.