I've never heard of it, and I am with you. I think he is just mistaken. We all agree that there are sublevels with potential, but 5 ball potential has always been MVP+ and I have never ever seen a case where a Superstar was 5 ball potential or a MVP was 4 ball potential. If someone comes up with some solid proof to show us otherwise, cool, but I have never seen this to be the case.
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs