I found this Warren Buffett quote in this Inc. Magazine article back in 2018:
“If you could invest in only one of your fellow classmates, who would you choose? If you could buy, say, 10% of the future earnings of just one classmate, who would you choose? What would you look for?”
The idea is that you won’t just necessarily look at raw IQ, you’ll look at other personality attributes, such as drive, ambition, and hopefully other attributes like honesty and integrity.