One thing I want to push back on a little bit is the idea this was some wild and unforeseeable development. He got picked 1st overall because in broad strokes this version of Slafkovsky was the player on the ice most of the time from Feb through May in his draft year, not because the scouts got a twinkle in their eye watching him struggle early in the year with his club team and predicted some magic random dice roll growth.
After his first 21 Liiga games in his draft year (September through December!), he had 29P in 43 combined competitive Olympic, Liiga, and World Championships games. Those results got handwaved away and a lot of the discussion around this player was hyperfocus on the 10 point total in 31 regular season games when 21 of those games took place early in the season when he was 17 and adjusting to pro hockey. His overall talent level got massively undersold because 31GP and 10P is what shows up on his hockeydb page.