Froome = Sky = Team GB.
If he's clean, they're clean. If he's a doper, they're all dopers.
The defense is that it's "marginal gains". Marginal gains that took Froome from being released to being one of the top GC riders in the world (Vuelta 2011).
Marginal gains that turned Porte into some guy that happened to have lucked his way into the pink jersey for 3 days during the middle of the 2010, to one of the top GC riders in the world.
Marginal gains that took Wiggins from a guy who won the Giro prologue in 2010, to one of the top GC riders in the world.
We can only assume they're all doing it the same way... whether that way is clean or dirty.
And, because it's the same "marginal gains" mantra that Brailsford used to explain countless gold medals, world championships, and world records on the track, we can assume the "marginal gains" there were no more or less legitimate as team Sky's.
And can't we even assume that Nicole Cooke's successes under Brailsford have the same level of legitimacy?
Frankly, what I saw today exceeded anything I've seen from Sky before. Maybe we'll learn that Porte had some strange Tasmanian disease no European doctor could spot?
If not, what's the explanation?