Surprised to see Koivunen left off your list considering you seem to put a premium on HIQ. His smarts are undoubtably his most standout trait and most outlets have him in the 35-50 range. Do you think his skillset is too bland?
I like the Zellweger shoutout but there's no way in my mind he becomes a better NHL defender than Edvinsson. Even if you question Edvinsson's decision-making (I think it's an overblown concern), his floor will still give him a lengthy NHL career, at worst, and i'd argue even his ceiling is higher than Zellweger considering the physical tools of Edv.
Putting up a hot WJC tournament production-wise has helped Tuomaala, Heimosalmi, and Koivunen's cases, but teams want to see these guys against men... Especially today where the Liiga has fallen off a little bit in quality vs. 10 years ago. None of these guys played against men, and in Tuomaala and Heimosalmi's case, they did not even dominate U20 competition in Finland. Koivunen was the only one to make an All-Star team in the U20 this year, and it was the 2nd team.
Right now there are three Finns in the NHL who break the trend of playing Liiga full time at 18 (if they played in Finland): Sami Vatanen, Joonas Donskoi, and Esa Lindell.
Sami Vatanen was on the U18 squad as a 17 and 18-year old and was stuck on the depth chart of the team that was ultimately the Liiga Champions that year. He probably would have been playing full time in the Liiga anywhere else, even though there are half the number of spots available for defensemen vs. forwards. Drafted 106th overall.
Donskoi still played half of the season in the Liiga as an 18 year old, played in the U20 league as a 17 year old, was a PPG+ in the U18's in his draft year, and dominated the U20 league in his draft year. He still only went 99th overall and went unsigned by Florida (the team that originally drafted him) before figuring it out a few years later. He's now a solid/high end 3rd line player for Colorado.
Lindell was a 6'3", 190 lbs puck moving defensive defenseman who put up a PPG+ in the U20 league as an 18 year old defenseman, and followed that up with a near PPG performance at the U18 tournament that same year. I think taking a swing on him with the 74th overall pick was a worthwhile risk, especially since, like Vatanen, he was stuck on the depth chart of a really high end team: Jokerit. They won the Bronze medal in the Liiga in his DY.
Compare that to the 2021 guys:
Heimosalmi played in the Assat system. Assat did not even make the Liiga playoffs. Their defense, for the most part, was a mess. If he was a high end prospect like some are claiming, he should have been a top 4 defenseman on that team this year. Instead, he couldn't even crack the team at all. He was solid, but unspectacular, at every point until he got to the U18 tournament. He did well there, and that is the only reason (besides maybe Covid messing things up this year) I even considered him as more than a fringe prospect. I have him as a long shot defenseman with complimentary top 4 defenseman upside.
Koivunen and Tuomaala played for a deeper Karpat system, but they are forwards. There are more spots for them. Raty played full time for Karpat this year, yet I have seen Tuomaala ranked above him a bunch of times. There are more opportunities for them. Once again, U18's (and Covid) are the only reason why they are even on the radar right now. I have them both as long shot high end 3rd line players similar to Donskoi right now.