Excellent Lantz! I really like articles like this that give specific drills and things to work on.
Can you elaborate a little more on the drill regarding the "divide through the chest"? What are we trying to accomplish, and muscles are we trying to activate in that (scaps/chest?)? Is that to add to the overall rotation of the shoulders (instead of purely rotating, you're also getting velocity from that segmentation, and not pulling with the glove), ie, you're adding another part/level to the kinetic chain?