Forgot to mention in the first post is another aspect. I like to refer to the idea/ quote about westside barbell using GMs 70% of the time for ME squat workouts. Training for chaos and the GM imitating the most chaotic position in a squat. Now can you think of anything in world sport as chaotic as a scrum?
You get push forward, backwards, up and down all at the same time, not to mention twisted in many way. In a squat you stand on flat ground with flat shoes, unrack out of a monolift, squat and re-rack into a monolift. That is a fairly controlled environment compared to a scrum (or most aspects of rugby) if you ask me. Therefore, some aspect of your strength work or core work needs to contain an element of chaos training.