Sky seem to have lost focus so far this year. They need a big result from someone soon. Flecha and Uran have been close, but not on the top step. Wiggins has probably got the ability, but there has to be a question mark over his mental approach. It may be that he had his best season before Sky, and he's not getting any younger or better right now. The management can talk things up all they like, but a slide down the rankings does not lie.
Thomas has probably got the best physical potential from observation, looks a good classics rider, but in the GT's he still has a lot to do. The only saving grace in all this is that the cleaner peloton is producing some varied results, and riders can't hold form like they used to, for months on end, so maybe things will change around as the season progresses. The Giro will be a pivotal point for some, I think.