Originally, Tom Danielson was supposed to be, for Discovery, what Contador has become. They (and a lot of us fans) thought a lot of him and felt he had a lot of potential. Over the past few years, however, he has not lived up to that -- and in fact has pretty much failed miserably. He also seemed to frequently have "illnesses" all the time, missing races, training, etc and never quite coming through.
Not too long ago, he was forced to come off the TDF team before it started because of horrible stomach problems. The doctors worked for months and months and couldn't find the problem. Well, they finally did: turns out he had two different parasites. One was contracted recently and was easily destroyed by the antibiotics but the other one took them some time. They finally traced it back to Malaysia (apparently it's a parasite that's common only there). Take a guess as to the last time he was in Malaysia? FOUR YEARS ago!
He said that since they cured him of the two parasites, he's felt better than he has in years. No wonder given he was riding for years with a parasite! So, I think the next 6-8 months could be Danielson's breakout. It'd be great if he came through big at the Vuelta.