You're an intelligent person, and it's always a pleasure to read your posts. This one, though I don't understand. Maybe it's because I don't like the diagramming tradition much. The human brain's natural linguistic capacity far exceeds its geometric intuitions, so we understand far more in natural language than we do from diagrams.
Just my opinion.
Hope you continue to post interesting things like this though, I could learn something. I really need to, to understand the point here.
Is it a racist joke I once heard in the seventies? Mona, Sue....