Here's an article that will give you some idea what the odds are of your picks turning into good players:
https://www.coppernblue.com/platform/amp/2011/4/4/2082829/nhl-draft-pick-value-first-round
Even if this is a really deep draft (the jury is still out on that), the probability of the #33 pick becoming a top player is just under 30%. And that's with stretching the 14-25 category when there isn't a lot of evidence we should.
So the question becomes: what are Puljujarvi's chances of becoming a top player? I'll look at his 19- and 21-year-old seasons to get some idea what his future could look like. I'm not using his 18-year-old season because there are so few comparables (Hughes and Kakko fit but that story isn't written yet), and I'm ignoring his 20-year-old season because he played with the nagging hip issue all year which finally ended his season prematurely.
As a 19-year-old Puljujarvi posted 0.31 P/GP in the NHL. Here are all the 19-year-old's who have posted +/- 0.05 P/GP from 00-01 to 17-18:
Beauvillier
Boedker
PM Bouchard
Josefson
Latendresse
Lindholm
Couterier
Lucic
O'Reilly
Jost
J Staal
Zacha
Turris
Johansen
Puljujarvi
Seguin
Tlusty
Burmistrov
Smith-Pelly
Weiss
McCann
Of those 20 player (not including Puljujarvi), 10 of them became "top" players under the criteria listed in the link, or 50%. The jury is still out on 4 of them (Beauvillier, Jost, Zacha and McCann), so if you exclude them you're left with 10 of 16, or 62.5%.
Now we turn to Jesse's 21-year-old season. He posted 53 points in 56 Liiga games and led the league in shots / corsi, etc. Using an NHLe conversion factor of 0.45, his equivalent P/GP in the NHL would have been 0.43. Using the same criteria as before (+/- 0.05 P/GP), we can see that 59 players matched at 21 years old. I'm not going to list them out, but you can check out the list here:
https://www.hockey-reference.com/play-index/psl_finder.cgi?request=1&match=single&year_min=2001&year_max=2018&season_start=1&season_end=-1&rookie=N&age_min=21&age_max=21&pos=F&is_playoffs=N&c1stat=points_per_game&c1comp=gt&c1val=0.38&c2stat=points_per_game&c2comp=lt&c2val=0.48&c3stat=games_played&c3comp=gt&c3val=40&threshhold=5&order_by=points_per_game
How many of them became "top" NHLers? Thirty, with the story not yet written with 5 of them: Dvorak, Niederreiter, McCann, Milano and Lehkonen. Dividing 30 into 54 gets us 55.5%.
I don't think it's unreasonable to conclude that Jesse Puljujarvi has >50% chance of becoming a top-6 forward in the NHL, which is a similar probability to that of a #4 - 7 pick in an average draft. I'm not going to say he's worth a top-10 pick in the upcoming draft because I don't think his ceiling is as high as those guys. There's a vast difference between being top-6 (Milan Lucic) and being top-6 (Nicklas Backstrom or Mitch Marner).
If Holland is indeed asking for a mid- to late-1st as has been speculated, I can certainly understand why. Puljujarvi has a higher floor than a typical pick in this range (he's far more likely to become a top-6 forward) and about as high a ceiling.