Just to add my 2 bob in as the U21 manager, I would imagine it would be very difficult for a player to make the U21 team as a PF/C with a season and a half of guard skills training, his inside skills just wouldn't be up to the required standard by the time he's 21 (not impossible though, if anyone can do it, an 18 y/o with the 4 inside skills at respectable can

). Having said that, I imagine such a player will be more wage efficient, and probably better for your own team (and as Direwolf says, you'll be able to train him for longer due to the wage costs being lower). Such a player would probably work out better for the NT in the long run.
I'll qualify this by saying I'm a guard trainer, and have less idea about big men training that others may have however
