I think we're saying the same thing here. I'd argue IQ is correlated with the some outcome, but that it causal of few or none. Is that roughly what you're getting at too?

When IQ is indicative but not predictive, I just don't see much use there. If I can't predict future behavior, success, or some other metric then I'm not sure why I'd zero in in IQ specifically. I have also found past experience to be indicitive but not predictive, and I don't need to trust a standardized testing method to review experience.