I'm thinking he'd actually be up there. Buzzerbeater has only been around for 14 seasons now, so 18yos the first season would now be only 32. In other words, we'd need to wait a season for any player trained from 18yo, and will probably need to wait 3-4 more seasons for many good players trained from 18yo to be over 33.
in the first season good trainees was very rare, and that wasn't kareen criteria ;) So a lot of teams trained a bit older guys, but real good player will come with the new potential system in that age.