Nibali has not looked good this spring. Okay, maybe he's had 9% body fat and is still working on his form for the Tour. But seems to me that in the recent past, when Nibali has faced Contador on a steep climb, he's been dropped.
Oh, hey, check this out - times up the Mortirolo - Contador climbed it almost 1 min faster than Landa, and did much of it solo, after chasing hard with his team on the 10 k flat leading to the climb.
TRAVEL TIMES ALONG THE MORTIROLO ASCENT - Giro d'Italia News