Rocca di Cambio, which I have raced up, is a climb done at 25-30k. It's an ascent where one sits good on the wheels, benefiting as he does from the draft and good for a strong Ardennes classics rider like Shleck, but isn't a suited finish for a climber like say Basso. It is therefore no indication of how Frank will react up the Giau, the Mortirolo, the Stelvio, etc.,.
Not saying he's not riding into form, but he has never shown himself previously to be the kind of rider to drop the Bigs at the front at the end of 3 week stage race, while fighting for overall victory. And this is what he will have to do. So wait and see.