The season that riders got their first GT podium:
Hinault - 4 years
LeMond - 4 years
Dumoulin - 6 years (he may not have been hyped up, but he's got 3 GT podiums)
Froome - 4 years
Contador - 5 years
This is pretty funny! So, it is Froome was lazy and then over the course of weeks, sharpened himself up 'cause now he was 'working' for the great purpose of Wiggins
And to get a bit reductionist, we also just look at years to a podium, and not what those years looked like. Macbindle covered this a bit with Hinault, but Lemond and Contador also had lots heading in the right direction in those years, including the year of those races. Even Dumo showed more in the years prior to his jump into GC battles. In all cases, we are talking about signs of talent and progression that can at least add up. None of that negates doping (duh), but one can track data points and see talent and progression.
Froome, nothing until le Vuelta (
edit - I should not say nothing, I should say signs of sporadic moderate talents), and then insanity. I guess the premise that he only started working in the month or two before the Vuelta, even though he had been with Sky for a while then, is where you have now placed all your belief.
That's OK though, because we all have things we
need to believe in, and things we suspend disbelief in. Personally, I like a good movie