I don't get people saying that Roglic is riding into form. That is not how it works. You need recovery to get better. you don't get better in a GT (if you do --> there is another subforum for that).
Roglic is at his best and i expect something from him today. (And i'm expecting his climbing to be above what he has shown before in any GT for that matter). (He looks extremely slim, not undercooked at all, no margin)
Exactly.
The only way you go 'down' in the 3rd week is because you have spent too much energy in the first couple of weeks (or in the weeks before the GT).
Those (of the GC riders) that emerge in the third week, aren't improving: They are deteriorating slower.
You have 3 scenarios:
1. you are in top shape and you save energy as much as possible in the first half of the GT --> you deteriorate but you seem to improve relative to your competitors in the 3rd week.
2. you are in top shape and you save energy as much as possible, but you are already for a long time in top shape or you are slightly overtrained --> you will deteriorate faster.
3. you are not in top shape. No matter what you do, you won't recover as much, you won't save energy as much, so you won't emerge in the 3rd week, unless you ride the first 2 weeks as training and are prepared to lose a massive amount of time so you could try to win a stage in the 3rd week.
As for Remco, he is probably in top shape, and if he saves energy, he can cope well with that 3rd week. But if he goes berserk or if he was too enthusiastic in his preparation (going 'the extra mile' = doing too much), he could well run out of energy.
As for Primoz, I think he is just fine. People overestimate his flat TT abilities (especially compared to an ever improving Remco), but he did quite well / according to his capabilities. And while he is a bit older (which could be a reason for not being as good anymore as say in 2020), he is still a force to be reckoned with. If he can save energy, he is probably still as good as any other top-5 rider uphill.