PJ has long arms and a 40 inch vert 6'6" dosent matter.
There's another thing PJ has that is not accounted for in these measurements. PJ has a large, powerfully built frame. I saw him up close at an exhibition game and was impressed by his size.
Chronologically he's still a kid. When he's 25 and filling out and much more muscular, along with his reach and vertical, he will be a handful.