Thanks for your advice.
I've purchased a replacement trainee to go with Ata and Grima.
Sebastian Schanzen (
(22970224))   
Age: 18
Height: 6'0" / 183 cm
Potential: allstar 
Jump Shot: average  Jump Range: mediocre  
Outside Def.: mediocre  Handling: average  
Driving: respectable  Passing: respectable  
I think I stopped my big man training on Pillay, Foreman, McDonald and Pavricky too early. Probably should have kept going for a few more seasons with them.
What length of time have you guys trainined your trainees for before selling or moving to different training?