Luv I am wondering how old your son is now? I think there is a happy medium here. You need to be able to turn and burn on the inside fastball also. Pulling the ball has become a dirty term for a lot.of people for some reason. But all the best hitters can do it. Early in the count I think you should look middle in and try to drive it. Later in the count you go with the pitch. The inside out swing is a valuable tool but really used when you were fooled and late on an inside fastball. Don't know why you would intentionally want to inside out a ball.