I think they factored each rating the same, I think that's why players who didn't dunk like Steve Nash had lower rating, he would have a 0 for dunk. If you increased that rating alone his rating would jump a bunch.
The ratings in this game was horrible I remember they had people rated in the 40s 😂 and rookie LeBron was 69 Wade 63 melo I believe was 67 and why ai rated 86 come on now but the gameplay for it's time was good