Some suggestions from the baseball player in the house:
- ideally the bat would move forward immediately (looks like the barrel goes back first). [kid says "he needs to get slotted"] A good drill for throwing the barrel off your body instead of dragging it is to use bottom hand only, and instead of swinging with your hand use your back shoulder. Turn and let the barrel go. The pictures below show the first move of some of the best hitters.
- the other suggestion is to work on a square. See linked video (1:30) for some starting points.
Kid says adbono is writing about the same thing (first movement) using slightly different language, and that the swing at 0:47 was better than the earlier swings, as far as slotting/moving the barrel forward immediately. 
