I don't see a lack of IQ. More of a lack of willingness to engage at times, which seems consistent with him being very young for his draft age, and also being a huge kid who isn't even close to growing into his body. Sort of a Casey Mittelstadt, if he were 5" taller, 30 lbs heavier, much stronger, and faster.
Having said all that, the guy matched(or near enough) Rossi for PPG this year, didn't he? I mean, what is he going to be like once he grows into his body, and starts developing man muscle?
I do see him make clever plays that show nice vision, and sweet hands.
I don't know who I'd compare him to. Getzlaf doesn't seem right. Schiefele, maybe? I can't remember what Malkin was like pre draft.