Marion was never the same after Starks undercut him. And the NBA decided there was no intent despite clear video evidence that it was done on purpose. I've never understood nor forgiven them for that decision, it bothered me (bothers me) even more than the Boris/Amare suspensions.
For sure. It amazes me how many Suns fans remember that play, which took place before boards like this one, and how much it changed Marion's play style. He was still an absolutely amazing player after that play, but he held himself back a bit, athletically, in the paint. Prior to that he would fly around in the paint like dudes do undefended in the dunk contest, soaring above everyone, he was the best leaper I've ever seen, especially that "2nd leap", he could jump higher than everyone and then get back up in the air at almost the same height when the other players were still gathering themselves. He still had that and you'd see him untilize it here and there after the Starks play but he was a lot more weary of his surroundings and didn't try to, literally, jump over people anymore.
And, no question, Stark did it on purpose. Like most Knick players of the era (even though he was on Utah at the time) he was trained to straddle the line between "manslaughter" and "hard nosed basketball".