I'm not going to pretend that I don't have doubts about Sky, because I do. However, to play devil's advocate, does the fact that Porte had a great day on Saturday and blew up on Sunday reassure any one at least a little bit? To me, that seems more like a potentially clean rider who got overly ambitious on the first day in the mountains, and paid the price on the second day.
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The rider in my avatar is David Etxebarria, not me.