180lbs at 5'11 is realy not that small if you aren't fat.180 pounds is likely in the bottom 10 of NHL dmen weight. Where are you getting that he has a ‘good’ amount of muscle?
Hughes is 170, Makar is 187, Deangelo is 180, adam fox is 180, Romanov who has been leveling KHLers at 19 year old is 182, Girard is 170 ( doubt it)
I don't see any of these players struggling to have an impact and i could go on and on with example.
Norlinder is HIGHLY trending up as a prospect and is far from a final product and Montreal is taking their time polishing him in sweden. He will likely spend no time in the AHL or VERY few.
i don't know much about the SHL in general other than how strong is it and Frolunda is a top notch organisation, from what i have heard the coach in Frolunda let's their player express themself on the ice and aren't penalised for making mistake, so he'll make mistake and learn while keeping his confidence to the highest!