NBA grades people out on potential. From NBA draft (
https://www.nbadraft.net/players/jaxson-robinson/) Jaxson rates out as an 8 on defense.
They say this, "Considered a high level defender … Defense has a lot of potential due to his length, but remains a work in progress"
His motor could use some work, but you can't teach length and a 7 foot wingspan will take you far in the NBA.