Hiro, I'm not sure what this portends either. But I'm guessing Wiggins, just like everyone else, has left something to work on and will expect to improve between now and Tour-time.
As for the Sky team, this was a slightly odd line-up. Thomas just there for the prologue and the training, and anyway will miss the tour in favour of the Olympic team pursuit. Cav just there for fitness pre-Giro. Froome not long back from injury and probably not in top shape. No Boasson-Hagen, Flecha, Stannard and so on. Very difficult to know what line-up they will field in the Tour.
Very impressed with Wiggo, though, I never seriously expected him to turn himself into a genuine GC contender, and he undoubtedly has.