I don´t believe he´s training too hard, because he knows himself quite well, and knows how to prepare. It´s actually quite similar for all of them. I´d say, from day 10 on, within a GT, it really starts to get hard, because the body calls for rest, and you know it´s still long.
The GC contenders all start the GTs with already low body fat percentages, 8 percent at the maximum, some even 6%. During the three weeks, you lose another 1, 2 or 3 percent points, and finish with 3-5 percent.
And, importantly, they all have good regeneration skills as well as a great immune system. But in case this system becomes influenced by a crash or even a slight virus, you won´t get it out before the end of the three weeks.
Only advantage they have during a GT: it´s a peak competition, something they have as a target. So they already enter it with low body fat, and so are allowed to refill their carbohydrate threshold every day - they even have to.
That´s different to the preparation periods in the spring: there, it´s even colder, and if a rider has to lose weight in February, March or April, he spends larger amounts of time (weeks) with never really full glycogen levels (only exception: important prep races). That´s bad for the immune system. But if you get ill in this period, you can rest a few days. In a GT, you can´t.
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