If I penalise the weaker prop, I won't have another stable scrum all game. The stronger prop has absolutely no incentive to "dominate but not destroy". In fact he has a fairly strong incentive to destroy.
If I penalise the stronger prop, I have a chance at stable scrums. However, as Phil says, winning the contest is what the game is all about, and this fellow is not doing it illegally.
If I penalise the stronger prop, I have a chance at stable scrums. However, as Phil says, winning the contest is what the game is all about, and this fellow is not doing it illegally.