For me, its always passing. When a guy sees the whole floor and sees a second ahead of what is happening, that screams IQ to me and I always value that because I dont think that can really jump 3 or 4 levels with coaching and practice. It will get better, obviously, with time but not by huge leaps and bounds. A low IQ player wont become super high IQ like a bad shooter can become a great one in time or a bad post up scorer can become a great one after a few summers. Watch this pass at the 3 minute mark. That is a guy who sees the whole court off the pick and roll (also, the ones at 3:25, 3:35, and 4:12)
https://www.youtube.com/watch?v=0lSZ27i284Q
I also like that he already has a one leg floater and an off the dribble jumper. Again, he was 18, playing professional ball and he should have struggled early on. But if he was the guy that he was the final 5-10 games for the whole season, I think people would be talking about him in the top 5 mix.