Or, to be fair to Tiago, some of his attacking instinct is reined in. Part of what made him fun in the first place was that he was the kind of rider who'd attack simply because the day was called Sábado, Domingo or had a number in it, but if he were to rein that in and ride a more intelligent race, he could get better results. The Portuguese cycling scene is pretty horrendous for doping, worse even than Spain, but Tiago came from Madeinox-Boavista, which, all things considered, is probably about as clean a team as you're going to get in that scene. We've all heard the stories about Paulinho telling Machado "you were the last. Lance says no more Portuguese" after the three Liberty Seguros riders (two of whom were Spaniards!) tested positive; but it's probably better for young Portuguese talents like Machado and Rui Costa that they are removed from the cauldron of the Volta early (even if they've gone to Radioshack and Caisse d'Epargne respectively, hardly walking adverts for clean cycling).
I like Tiago. He's fun to watch. He'll probably never fulfil his potential as long as he remains entertaining, but if he's clean, then all power to him. If he's not, oh well, back to the drawing board.