first one center training -> mainly IS, ID and Reb blocking ain't that imporpant
second one -> i think center training two, but he need a lot of rebound training first
third one -> he is an guard, so he need training in the sixth skills above, if you go for SG more training in OD; JS; JR and driving for PG he needs more of OD, PS and Driving
fourth one -> also an guard who needs to work on his weaknesses especially range and passing first.