Same with McDavid (who was coming of injury), it is way too small a sample size to draw a conclusion.The scoring race competition in NLA is way tougher then in Finland. PPG aside he is performing much better then the Finns.
And to your initial statement, no. Crosby didn't outperform everyone in WJC and he is the player of a whole generation. So your WJC foundness is silly.
Matthew's looks to have the potential to be Sakic level good. Its not like what he's doing in Switzerland is all that people are basing his draft position on. Matthews last year broke the scoring record at the USNDP program surpassing guys like P. Kane, Eichel, and Kessel, and he is a complete all-around center. How many center prospects have had his combo of skating, passing, shot and strong two-way game recently? Maybe Eichel? The guy might be the most complete all around center to enter the draft in a long time. McDavid isn't as well rounded, but his uber-elite hands, vision and skating make him the best prospect to emerge in awhile, even if he is weaker than Matthews in regards to defensive play and physicality. The only knock I ever hear about him is that he's not as dynamic as flashier guys like Eichel.