yeah, Jordan Peterson the ineffable intellect, has sharpened the point of intelligence to one measure, "How many numbers can you remember at a time". He's full of sh*t. In terms of the 'g' factor it can't be narrowed down to one aspect of 'working memory'.
How many numbers can you keep in your head at a time?
I've actually always been limited in my ability to do that about average: 6 or 7 numbers would be typical, occasionally one or two more. Yet, I managed to master various levels of advanced math such as Discrete mathematics, linear algebra, graph theory, and Trigonometry after deliberately failing high school maths. My verbal intelligence has been measured in the top 99.97 percentile. I really disagree with that guy, and dislike him Wind ... He's a pedagogical buffoon peacock, he should be slapped.