I see. No, I dont think he'll become a hall of famer, or have that peak that Z had. You're totally disregarding what Z did on an international level prior his NHL debut, but 'm not gonna say anything more on this matter
It is fascinating how selective memory can sometimes be. Anyway, here is the comparison of the 22 year old Zetterberg and 19 year old Aho in men's international play.
Zetterberg:
played games 51, points 8+19=27
PPG 0,53
Aho:
played games 31, points 8+17=25
PPG 0,81
So Aho was three years younger in international play, played 20 games less than the 22 year old Zetterberg and still managed to score as much goals, almost as much points and with a way better PPG.
So lets just wait and see if he will become as good as Zetterberg was in his prime. He for sure is better than Zetterberg was as a 19 year old, so it should not at least be impossible to reach the same level in his prime. I will not claim it happens for sure, but I think it is not correct to claim the opposite as a sure thing either.