I am training big men, and i usually playing LI. From my experience, i am very pleased from my big men, even with those that they have atrocious on PA/DR. I would like to have passing training for the big men thought. I think that passing is very important skill for any position. Unfortunately other than to put the C out of his position, to train passing, is team training who is painful slow.
Anyway my advice is to focus on there primary skills, than wasting training time those 2ndary skills