The same way we shouldn't place Matthews in the top tier of NHL players until he's put up more than 80 points?
Don't be dense. When Pettersson is scoring at nearly a PPG, as an undersized 20 year old, it's a pretty safe bet that he'll be a good deal better than that in his prime. The kid was pacing at around 80 points... you don't think he can tag on another 10 when he puts on some more weight and gains some more NHL experience?
But, you see, this is the thing that confuses me about posters like yourself. If you have to make dumb remarks, at the expense of trolling another fanbase, what do you really get out of it? It seems like the lowest form of self-satisfaction.