D+1 seasons were a massive red flag for both. Trajectory was flat for Juolevi and down significantly for Virtanen. Both were on bust watch early. Juolevi's skating and timid play were major concerns that were identified early and became glaring deficiencies in his 2nd camp.
Players picked in the top quarter of the first round who don't dominate junior or whatever non NHL pro league they play in are immediate bust watch candidates. a second year of stagnation is a very worrying sign.
Lekkerimaki was also on bust watch early because of his poor D+1 season, but bounced back significantly in D+2 and his ability to generate offense in the AHL is encouraging.
Willander has tracked well out of the gate and if he busts it will likely be a serious injury that robs him of his mobility. If he stays healthy he's a lock to play hard minutes at ES and PK with some offensive upside. If the offense develops, he's a 25 min all sits stud IMO.
Juolevi had a poor D+1, but a solid D+2 in Finland. I still think if he had managed to stay healthy he would have been an NHL player. Basically lost the ability to pivot in 1 direction and that was enough of a flaw to expose him at the NHL level.
Lekkerimaki's D+1 was poor entirely because of Mono and injuries. This was pretty obvious at the time because he got better and better as the season went on. When he returned to full health for the second round of the playoffs he put up 14 points (4 G 10 A) in the final 13 games against Bjorkloven and MODO. These were the top two teams in the Allsvenskan that year by a good margin and MODO was certainly better than the bottom feeders in the SHL at the time (which they proved by avoiding relegation with a similar team the next year), so this was essentially point per game play against SHL competition when the stakes were highest with promotion on the line. He was criticized for his showing at the WJC that year, but his underlying chance creation and scoring numbers were still among the best on the team despite him looking obviously not up to game speed and not getting much ice-time.
I watched most of his SHL games last year, and though he had a good season, finishing 7th in goal scoring with 19 goals in 46 games (first among U24 players as a 19 year old), he was also unlucky to only pick up 12 assists to go with his goals. You can check my post history on Lekkerimaki for more details, but basically he is a much better passer than these stats suggest, it was just that his linemates couldn't finish their opportunities and he played on a low scoring team overall.
All that said, he needed to come in to the AHL and put up close to PPG (>0.8 PPG) if he was going to have any likelihood of becoming a scorer at the NHL level. If he can continue to do so, which sure looks plausible based on his shot volume, then the Canucks likely have a bonafide top 6 calibre talent on their hands.