Matt Gilroy was touted by some to step in from the NCAA to be an immediate top 4 NHL defender. Gilroy was a bit unusual being that he was 25 and finishing up college since he wanted to play with his brother.
Something that gets a little lost with Brunnstrom was that the CBA rules changed in 2005. Before that European (trained) players had to be drafted into the NHL regardless of age. So that's why we saw teams spend draft picks on guys like Roman Cechmanek (29 years old), Johan Franzen (24), and Mark Streit (26) before 2005. Guys like Daniel Alfredsson and Pekka Rinne would have been undrafted free agents by the post-2005 rules.
The NCAA talent pool started getting better around this time too and the Ducks had just won the Cup with contributions from Andy McDonald, Chris Kunitz, and Dustin Penner. So the competition for the "free wallet" UFAs got a bit more intense as teams were understanding they needed useful guys on ELCs in a cap environment.
Unfortunately for Brunnstrom, he was one of the first high profile undrafted Europeans of the post-2005 era. Mix in higher amount of online media coverage as well.
I remember finding a copy of The Hockey News when cleaning up my childhood room and Florida signing Dan Boyle as an undrafted free agent was just a blurb you'd read about two weeks after it happened. Now we'll keep track of where guys like Drake Caggiula and Will Butcher are visiting prior to signing.
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And then on the note of older Europeans, Jiri Dopita was often cited as the best player not in the NHL in the late 90's. After Cechmanek had success in Philadelphia, he convinced Dopita to give North America a chance. But it seemed like Dopita (and his wife) never got adjusted.
Devils fans got a little too excited for Nikita Gusev a few years back. I think there was a little too much hockeydb "scouting" to try to tout him as the next Panarin. Gusev didn't have the wheels to play the type of game he was trying to execute. And then mix in the pandemic plus his wife having their first kid and I think it was just a chaotic time.