As a senior in HS, he was a 6'5 SG and measured 6'10 at the combine with a 7'3 wingspan last year. He's still adjusting to his growth and just turned 20 a month ago.
Supposedly Barlow has added 10-15lbs of muscle to settle into more of a 5 spot. He was 221 at the combine last summer.
https://instagr.am/p/CuQq4sZrSkb
Last year in Austin, Barlow averaged 16/8 with 1.7b on .553/.304/.775 shooting.