Yeah that's how training works. It's why there are people who can climb hills all day long, and those who can do silly speeds for 200m at the end of a race.
Take away the crowds,the team support, the cameras and the monetary reward. What he did ultimately was ride a bike up some hills, the same hills are accessible to anyone to ride up.
The question was about his power relative to the other riders. So yes, anyone could ride up those hills, but not at those speeds or with the acceleration that Froome produced, pulling away from a highly talented field. Mark Cavendish is a top rider who trains incredibly hard, but his body type is different and he is more suited to sprints. I could train all my life for the 100m, but I would never be any good at it, because my body is suited far more to long-distance, endurance events.
Again, you don't know how hard everyone else trained in comparison(nor relatively) - as you don't know precisely how each of the riders trained.
The balance is pretty clear. Still not sure why you think this "He must have an even greater tendency towards anaerobic"
FFS. I think you need to check the definition of the word "assumption" - it means a belief, held without proof. I stated on numerous occasions it was an assumption. At no point did I suggest this was the definitive opinion on Chris Froome or his muscle composition, it was just my opinion. I'd have thought my train of though was abundantly clear, but if not, let me try one last time:
I assume all riders are training just as hard for the biggest race in the world, Chris Froome has shown a substantial advantage over the others, ergo, I assume that there is something particular about his body that enables him to do that - such as living at altitude or having a genetic advantage in terms of his muscle composition.
I hope that satisfies your curiosity, because I'm done with this.