The more impressive thing was ability to hide from the news and general attention of the teams. Or so it seems. He didn't spend his time off the front getting camera time, just getting really good time. That win would have been impressive alone, but that it put him in yellow is a comment on the other days.
Every race is different. I think he will need more mass to do well in general WT races. We shall see. He has been racing a while. I can't easily tell if he is that much better, or there were no races quite so well suited to his abilities as Baldy.