On a classic flat sprint Sagan has been beaten every time this Tour. Granted he hasn't had a train. On an uphill sprint, he is unbeaten. So, a "strong man" rider? Or does he climb well enough to be a GC contender someday?
I think he will be a really strong all round rider like Jalabert of France in a few years. Not a sprinting specialist, but they will fear him in a 3-5 men break near the finish. Looking at him, I think he can climb ok. He will put the hurt on them in the Ardennes classics or even Paris Nice in the Spring. Give him a few more years, he will even be faster all rounder. Can he time trial?