Wiggins is ill just like anyone who live on earth. That's probably the reason of lack cluster result so far. Someone's articles suggested last year when wiggins came in to TDF with super skinny body after loosing weight, that he might be in trouble when the weather got cold or rain. Last year it didn't happen at the TDF. Or maybe it did, but he was masked by his team strength, who knows.
Well maybe because he is too skinny now, he is prone to get sick when weather is so faulty like the first week. Sky has been spending so much time in sunny tenerife and comes giro the weather so far has been hot and cold, rain a lot. It probably took a toll on his skinny body. Nibali and Evan should be careful not to get sick. I suspect hesjedal is hit with the same problem, he just probably doesn't realize it.
For someone sick, wiggins is not bad to loose only 2 minutes. But I think he did great in managing his health problem and just loosing 2 minutes. Eventually when you sick you'll come out of it. So, he'll be dangerous in the last week, if he gets healthy in time. **disclaimer I'm no wiggins supporter either and maybe more in the side of don't like wiggin that much**