He'll have set a new benchmark/standard for individual achievement, rewriting record after record with anomalous performance year-after-year. To do it with three different franchises (particularly when he's taking bottom-barrel lottery teams and turning them into champions) would yet another unprecedented feat.

Never before has a singular player essentially been a traveling dynasty on his own merits, competing in NBA Finals for a decade straight, regardless of what team he's on - and winning 4 in total (with one title at the beginning of the decade and capping one off at the very end of the decade).

To do this in the modern era is bananas - it'll never be done again.