One little detail I find quite interesting is that out of the players that played over 20 games Pulju was the 1st in all of NHL at 1st assists/60 min. Yes I chose the 20 game limit to support my point, but the fact is that the four players ahead played just 5-17 games.
I know 28 games, which include some where he got just three minutes of ice time, is not very much. I also know that in scoring goals the stats results would be very different. So I don't mean to draw strong conclusions, but it shows that next year he could provide some important assists, and possibly be elite at that, so I am shocked if Pulju won't get a real chance then. I'm pretty sure he will, though.
We are talking about a total of 7 assists. 8 out the top 10 in firstA/60 have played between 75 and 288 mins. Only Getzlaf and McDavid manage to break into the top 10. When we are talking sample sizes these small there is a lot of luck involved. You need to see the games and watch the player. I actually like Puljujarvi so far, but I do think you are (and have been) taking this stat line too far.
1
McD, Puljuvarvi and Maroon come in three on two playing the Caps. McD has the puck, goes around his man and sets up Puljujarvi at the far post (good movement by Puljujavi). Puljujarvi gets a unlucky and puck goes Holtby's shoulder -> post and out, Maroon scores on the rebound.
2
P blocks a shot and moves up the ice creating a two on one with Maroon, manages to get around his D (barely) and gives the puck to Maroons who scores.
3
Benning shot from the point, in front of the goal P manages to get his stick on the puck (in air), McDavid sweeps it in.
4
McD brings the puck in, drops it, P right behind him one times it, a good shot, and McD scores on the rebound.
5
P down on the ice after board battle (at the red line), gets it out and Slepy picks it up. Slepy skates in and scores, using the CHI line change. Bad play by CHI D, and Crawford also let in softie.
6
Lucic breaks up a play in EDM zone, gets it to P who immediately gets it to McDavid who is just leaving EDM zone. Good instincts by P to look for McD. McDavid break away where he makes OEL look Hal Gill-slow...
7
Puck along the boards in EDM zone and P manages to get the puck forward. Drai picks it up and goes all the way and scores.
Summing that up: two rebounds, two times getting the puck out from the boards, one two on one (in which he almost lost the puck imho), one break away pass from/in our own zone to McD and finally one shove of the puck in front of the net.
I am not trying to downplay his points, but I don't see how looking at those assists you can draw any kind of conclusion to be honest. Also, I know he had other plays which were very good so these seven assists are far from the entire story of Puljujarvi.
I do think you are a bit stuck on these stats though which actually don't mean very much at all due to the low TOI and GP. He scored 4 of those assists when McD was on a tear scoring his first hatrick and 9 pts in 4 games... Normally streaks even out over the course of a year but not if you don't play very much.