The best argument I can make in favour of Horner being not the most dirty rider in the dirty history of cycling, is that his transformation was so grotesque over the years (from non contract, never being considered for a GT before age 34 to become the oldest GT winner by far) that it can't be explained by blood/Epo doping only, if you're to believe Mr Vaughters doping these days provides only a marginal boost if you're to have any chance of beating the tests.* Thus there must be something into that new approach of riding less, but if riding, doing it on one leg out of the saddle to save energy**. Given the facts of having only 16 race days so far, Horner shall have no problems to win the TdF by a good margin. Everything else would be an underachievement for the greatest ever.
* I don't believe that but it's the best I can come up with in Horners defence.
** Hope the sarcasm gets trou, since riding uphill constantly out of the saddle to save energy is a contradiction in itself...