I stand by my comment. How old was he before he came to UAE? He was a pup. He is still a pup. He won 2018 Tour de l'Avenir riding for another team. That shows he had GC talent.
Natural progression is gaining a few watts every year, not 0.5W/kg sustained for longer in less than half a year, while riding a bike his whole life.
He went from top 5 in tour of Slovenia to winning it on one leg while riding backwards.
Already doing mind boggling good in his first tour but clearly fading a bit, then followed by his best ever TT by miles. Before that his TT has been subpar by far, now it is one of his strongest elements. at top of the the world level.. (Froome style). On top of that, we are being told he is so good in the TT because he doesn't focus on the aero aspect so much... because that is what you are going to do in the final TT of the tour.
Now we are being told, just like Armstrong, hwho had very low lactate levels..., because he trains like every pro (amateur) cyclist... very long time at low intensity
Not so long ago we had Froome and his goons, who were incredible with very strange uphill accelerations.... that was because the trained uphill sprints and nobody else did... (every pro/amateur does that).
Looked up his first Vuelta, his best performance there seems to be: (only see data for first 9 stages, but that is enough to get an id i think)
Mas de la Costa: 15:44
Avg Power: 392 W (5.94 W/kg)
Avg Speed: 14.5 kph (9.0 mph)
Avg Gradient: 12.4 percent
Avg Cadence: 86 rpm
Full Stage: 4:35:21
The tour the following year he pushes 6.5W/kg for longer duration. On climbs of <20minutes he probably does closer to 7W/kg now... Mind you this is in less than a year for someone who rides a bike his whole life. If he jumped to 400W that would be called a breakthrough and good progress, he went to 430).
Good that you can still 'believe' though, makes watching probably more enjoyful!