Here are my 2 cents. Maybe a narrow angle, because I sometimes tend to overfocus on hockey-iq. I see the flaws in Lias' skating, but put less emphasis on that issue.
Lias just isn't able to process the game at the speed required for him to be a successful NHL-er.
Now, the tricky part here is that this "required speed" is different for different players. The limit is set individually at the point where you are not able to play your A-game anymore, unable to use the skills that are your strength - that define you as a hockey player. And we are talking game evolvement speed, not foot speed here.
This ceiling normally hits players at the ages 15-18, when speed generally picks up drastically and the ice-surface "shrinks", free ice is no more. Then comes increased quality of competition (including playing against men) and lastly, for European NHL-prospects, the actual reduction in rink size.
So what's the solution for Lias? Well, either accept your ceiling and settle for another playground. Or grind it out like Magnus Paajarvi (once a consensus generational talent, playing World Juniors as a three-year underager, who hit a similar ceiling as Lias is facing now). Or change your style of play to better fit in a role that is in demand and that you may have a bigger chance mastering. This is of course much easier said than done - after all, the player you are is usually a product of why you fell in love with hockey in the first place. But there are examples - Marcus Krüger always comes to mind, transforming from an entertainingly offensively skillful, goal scoring youngster taking the SHL by storm to a world class shut down center winning cups with the Blackhawks.
Finally I have a question to those HF-posters who have better understanding of the scouting process (including the combine event): Why isn't more done to try to single out how players process the game? After all, there is obviously huge value in getting an edge here. Or at least not picking lemons.