He is 177 lbs at age 18 and only has a 6'6 wingspan. When you consider his weight and he has zero length to make up for it that's a big problem defensively
He had a standing reach of 8'9" which is right in line with the other players that were of similar height at the tryouts. His length is fine.
Matthew Hurt, 6'10" and a standing reach of 8'10"
Jeremiah Robinson Earl 6'9" and a standing reach of 8'10"
Anton Watson 6'9.5" and a standing reach of 8'9.5"