Of course if having a brain would be on the table there would be no contest.
Being the highest correlation in a rather arbitrary list is not a valid qualifier for being a good correlation.
> Of course if having a brain would be on the table there would be no contest.
Is that really what you think? In reality, the possession of a brain can't have any correlation with SAT scores at all, because there is zero variance in the trait.
They said "highest", not "solid". Family income isn't the highest factor there.