Maker is 19, but he's petitioning the NBA to declare him "a year removed from high school." Maker graduated high school in June of 2015 and has been playing ball at a Canadian prep school this past year as a "post-grad player."
Now, plenty of players have bypassed college and still made a leap into the league. Orlando Magic guard Brandon Jennings went to play in Italy for a year before entering the NBA draft.
But Maker is different because he's still playing high school ball as a "post-grad," which is an avenue to the NBA that hasn't really been tested before.
But perhaps what's more pressing than if he's eligible for the draft is if he's ready for the NBA.