My main question is who is his goalie coach? That’s who is “developing” him.
His name is Marko Torenius... or at least, that's the St. Petersburg goalie coach. But sometimes it isn't quite that simple with goalies. I know Vasilevskiy really benefited during his development years in Russia from come over to work off-seasons with a Canadian guy. So Torenius is the team goalie coach. But the KHL team has used 5 goalies, the VHL team has 7 goalies on the roster, and the MHL team has 8. Well a bunch of those overlap. I think I count 13 different guys across the levels? So if he's really working with all of them, he's pretty busy. Over here anyway, goalies will work with different private coaches they like, independent of team affiliations too. I don't know if Askarov has a guy like that. Or how they really work things.
Torenius has Shesterkin on his resume, although again, how much of that was his doing, how much Shesterkin got from elsewhere or just being amazing, who knows.
So I guess per some of the discussions in the WJC thread, there's really nothing much we can say. There's a boat load of goalies over there, and the team has a goalie coach, and how good he is, or how well he meshes with Askarov, or how teachable Askarov is, etc, etc... there are just really too many variables for us to have any clue from the peanut gallery. I can definitely say that it's also very possible for a goalie coach to be an excellent goalie coach with a great reputation... but just not be quite the right fit for a given player. Sometimes the player is just on the right wavelength with a different guy, and it doesn't necessarily reflect in any way on the coach.