If you compare his numbers to the average for a 4 (i.e. rather than a 5), they look absolutely great (including from the POV of Wins Produce/48, btw).
Maybe best just to compare his numbers to an appropriate other guy -- say a known really good player like Domantas Sabonis.
Per 36 minutes, KP produces 5.6 more points than DS. But he uses @5.4 more possessions to do so. 4.7 more shots & 1.7 more trips to the line. Meaning that those extra points are produced at a .514 TS% -- well below the team's average. That's a problem (I remind you to take a look at our record).
Sabonis is a substantially better rebounder -- 35% more boards (including 50% more offensive boards -- which no doubt contribute to his substantially more efficient scoring).
OTOH, Sabonis turns the ball over somewhat more, & gets just slightly fewer steals than KP. Which narrows that large positive difference in offensive efficiency a bit. & he fouls a little bit more too. While KP blocks 1.1 more shots in the same 36 minutes.
Of course, there are factors that aren't in those numbers: maybe the way KP plays makes other players more efficient on offense? Best way to judge that, I'd say, would be to see whether those "other players" are having atypically efficient seasons on offense. But... I don't see that in the numbers.
Plus, I've left something out: to my complete shock, I see that Domantas Sabonis delivers 7.3 assists per 36 minutes! Seems amazing -- that's good for a point guard let alone a big!
I guess Damontas Sabonis is a big reason why the Kings have a 39-26 record.
To put it another way, based on all the above, & especially considering the substantial difference in the two guys' TS% (.673 vs .633), no one but a loyal Wizards fan could think that Kristaps Porziņģis was within miles of being as effective a player as Sabonis. It ain't close.
But... this forum is populated by "loyal Wizards fans," so that conclusion will not be tolerated I am sure!

















