team's huge improvement was the primary factor.
I feel absolutely 100% of people think this, they disagree with it.
The Pens won 16 games in 1984, who turned them around to be a 87 points playoff team in 1989 ?
Outside Lemieux line no forward were a + on the 1989 Penguins, Lemieux-Errey were +40.
In the question of who was more valuable to his hockey club, being the first season can make it easier to see for sure, but does not mean it should be relevant (it could but there is no of course here, if you just saying of course it will influence and create a bias among voter, yes no one disagree with you).
The 87/88-88/89 Penguins without Lemieux won 2 games on 7 I think.
The 89-90 penguins when Mario missed game and did not had nearly as good season when he played were out of the playoff (something voter did not know yet obviously).
It is very possible that the Pens sans Mario are significantly worse than the Kings sans Gretzky that season and that Mario had a bigger impact on them... And if it is true, should it matter if it is year 1, 2 or 5 ?
But a player of that caliber, presence is more than his play on the ice, from the coach to the equipment staff to the AHL prospect, to the Kings regular players, someone like Gretzky coming could have changed their summer, camp and attitude all around, a bit like when Peyton Manning-Brady-LeBron arrived somewhere.