my experience with training 3 positions is that though hindi nga weekly yung pag-pop ng skills ng players, mas marami ang nattrain mo. mas nagiging well-rounded yung team mo.
well, it also depends sa potential, age, height, and playing time ng trainees mo kung makuha nila yung max training. but i've tried training 1, 2, and 3 positions, and parang mas gusto ko na nagttrain ako ng 3 especially for inside defense and pressure since crucial for SF ang OD and ID.
diskarte mo talaga yan how you want to approach your training pero feel free to BB-Mail any of us here, and i'm sure we're more than willing to help you out. :)
and btw, pansin ko Look Inside is the more often used tactic by teams since it's fairly an easier skill to train, so you might want to go against the grain and train your guards and SF hehe. will it work? look at team Hoes (PPL) ;) just a suggestion hehe