Scrap. I'll give the poker a miss (already had a poker this week, and once is enough for even the greediest of us ), however, the final post on the shoulder is something that I can use. I have always coached hip and therefore upper body rotation for straight shots, and the initiator for this is as you say the back foot. One of the problems that I have encountered with boxers over the years is under-rotation when throwing the straight back hand (right cross.) The boxer under-rotates and as a consequence loses length and leverage on the shot. They lose confidence in the shot because they get caught when throwing it, and this loss of confidence causes more under-rotation and so on and so on. In the end, they can stop throwing the shot altogether.

Now, fixing this problem is where your shoulder tip comes in. I always make the boxer really focus on the drive from the back foot, but when trying to fix a problem the boxer can sometimes struggle with this. Your tip of throwing the left shoulder back in order to propel the right shoulder forward seems to me to be a useful method of emphasising that rotation, it's certainly something that I can use in the gym.

Good stuff Scrap, like that one.