I always find the issue of MacKinnon’s hockey IQ to be more complicated than people realize.
Does he have a high IQ for the average person that plays hockey? Absolutely, it's very high. Is it high for the average pro hockey player? Yes, definitely. Is it high for the average NHLer? Yes, it is. The NHL is littered with 2nd, 3rd, and 4th liners that don’t possess the vision and instincts he has.
Now here’s where the nuance comes in. Does Nate have a high hockey IQ for a top line star forward? The kind that was drafted 1st overall? No.
It's still not that simple though, because he also has to process the game much faster than almost anyone on the ice, since he plays the game at a speed faster than almost anyone else. If he played at a slower, more deliberate pace, he’d have much more time to process the game.
But when he’s flying around, he’s got to concentrate on not losing the puck skating that fast, where all the opposition players are, if anyone is gonna catch him with his head down with a big hit, where the goalie is leaving holes to shoot at, where his teammates are, where the passing lanes are. He has to process all these things much quicker than everyone else, and on top of that, he’s engaged in a level of creative thinking in order to make plays that aren’t expected.
He has less time to process all these things that hockey players have to process, because he's playing faster than everyone. You can see it in him too. He's trying to push the pace. He's trying to overwhelm you with his speed. That's the tool he's relying on most to create offense, because that's his best tool.
So, does someone like Drouin have a better hockey IQ than MacKinnon? Yeah, absolutely, but that’s his biggest strength, and he’s one of the best in the world in that area. He also doesn’t push the pace quite as much as Nate, so he’s not forced to process the game as fast.
I consider Nate to have an average hockey IQ for a top line offensive forward, but he’s definitely above average in general terms. Same goes for Duchene.
I think both have issues of trusting their line mates like darthwispy alluded to, but I think that mostly happens when they play with the wrong line mates. When they play with someone they have respect for their skill and IQ, they do trust them, and click well with them.