Filip didn't have a great 17 year old tournament, got only 1 point. When he was 18 years old he got 5 points, and then 19 years old he got 12 points.
When it comes to players in their 17 year old season, in recent years I think it's Alex Nylander.
Here's a list of players who are currently playing in the NHL (and Daniel and Henrik Sedin), and how many points they had in the WJC when they were 17 years old. I might have missed someone.
Player | Games | Goals | Assists | Points |
Alexander Nylander | 7 | 4 | 5 | 9 |
Nicklas Bäckström | 6 | 4 | 3 | 7 |
Rasmus Dahlin | 7 | 0 | 6 | 6 |
Daniel Sedin (17 yr season) | 7 | 4 | 1 | 5 |
Henrik Sedin (17 yr season) | 7 | 0 | 4 | 4 |
Elias Lindholm | 6 | 2 | 2 | 4 |
Rickard Rakell | 5 | 0 | 3 | 3 |
Gabriel Landeskog | 1 | 1 | 1 | 2 |
Victor Hedman | 6 | 0 | 2 | 2 |
Elias Pettersson | 6 | 0 | 1 | 1 |
Filip Forsberg | 6 | 0 | 1 | 1 |
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A lot of players who are now prominent NHLers didn't play the WJC at 17-years old, to name a few: Erik Karlsson, William Karlsson, Oliver Ekman-Larsson, Mika Zibanejad and William Nylander.