There is no indication why Dvorsky could never be a 1st liner. He made very good progress this year, but people are usually just looking at points. Even in this field, he progressed, he is 2ppg in U20, same as Carlsson last year (being 6 months younger than Carlsson). He improved his defensive play significantly which is very genuine for 17y kid in his draft year.
It is just crazy that after all those years people do not see the difference between major juniors and pro hockey in Europe path for young prospects. In their draft year, those are 17y kids coming to men league. Pro teammates, experienced opponents, it is very difficult to establish at that age.
Most of NA kids start their pro career at 20 and still struggle to adjust. We will see how Kidney, Roy, Farrell, Struble adjust to pro next season.