I mean skating can be hard to project, let's be honest
From one year to the next?
Leo has a technical flaw where he doesn't bend much at the ankles, and every scout saw it last year. But he's a really powerful fast skater in the mold of many great #1 centers. He immediately moves well in the NHL, from game one.
That wasn't an issue of failing to project his growth as a skater, it was just scouts overfocusing on technique at the expense of how good the player is at actually moving around.
Somewhat different flaw with Demidov but again it's the same thing where some scouts are looking at technique and not actual movement ability. Demidov isn't very fast but his balance and agility are high end, regardless of any knock knee.