Some things to consider:
Practice the week (PTW) has a big effect on DMI.
Centers tend to have somewhat higher DMI's and salary than other positions. I don't know whether height is being used in the salary calculation directly, or taller players tend to have higher skills in areas that figure into the salary calculation. So your player might be your best big man, but he might not be your best player.
He can certainly benefit from team stamina and FT training. He might be able to improve from handling and passing training as well.
You'd probably have to train his shooting to catch up with his other inside skills, and his defense and rebounding might be perfectly adequate to stop an opposing center from scoring.