Well you're wrong. Let's start high-level at the committees and bureaucracies surrounding koryū:
- Nihon KobudÅ KyÅkai (ę„ę¬å¤ę¦éåä¼) ā established 1979, affiliated with the Agency for Cultural Affairs, and organiser of the annual Meiji Shrine KobudÅ Enbu. It maintains a curated registry of recognised classical ryÅ«.
- Nihon KobudÅ ShinkÅkai (ę„ę¬å¤ę¦éęÆčä¼) ā founded 1935, focused on preservation and public demonstration of classical martial traditions.
These bodies do not judge āwho can win a fight.ā They evaluate historical continuity, documented succession, and recognised transmission. In your words: "
structural legitimacy".
Speaking of, Prof. Karl Friday wrote an article aptly named "
The Whole Legitimacy Thing":
I've been following the discussion of the issue of authorized vs. unsanctioned instruction in koryu arts, specifically with respect to the Katori Shint ...
koryu.com
As for the "beating people up" part... yeah... I can't say I've ever considered that a requisite for any martial art I've trained in. Ever.