The lucky thing for him, is that his player looks like a SF build (Maybe a PF) so the training plan for U21 and best training for him isn't as drastically different as it would be if he was a flat out center or guard. I definitely agree with you that U21 Nt players tend to be very very mono skilled and tend to flood the market once they are 22-23 due to not having as good secondaries. Unfortunately this is the only way to compete with other nations who of course are doing the same thing haha

Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs