The Rantanen comparison is what I see the most to justify this, but Rantanen started the explode production wise after that. Slaf never showed that sort of production until he got to show off against subpar competition.Most posters don't know what to do with #'s though. I see it all the time when dealing with Euro leagues that clearly posters don't watch a lot of say KHL, SHL or Liiga games.
With prospects it's not about the #'s, it's about how much or little they progress, to which no one knows. At 17, Rantanen had 9 pts in 37 Liiga games. Slaf had 10 in 31 at 17 as he turned 18 at the end of the regular season in March. It's not meant to compare them, just that if you drag Slaf for his #'s, what about Rantanen and his #'s? Now Rantanen clearly had great progress, just saying that #'s are misleading and in the end they don't tell the story, Slaf will either progress or he won't, only time will tell.
There's obviously a lot of other factors. Kotkamiemi's mediocre production (that was significantly better than this) was blamed on a late growth spurt and a thin frame he had to grow into. Slaf is already built like a man meaning his poor production can't even be blamed on being out muscled by more mature players.