Ninjutsu within other Koryu Arts

Rook

Black Belt
Certain koryu ryus like Katori Shinto Ryu are fairly frequently referanced as having a "ninjutsu component" as well as solid history.

Has anyone within the X-kans reached a level within those arts or is in close enough contact with someone who has to get any sort of comparison between what the X-kans do and what is done in the other ryu?

I realize that information within many koryu ryu is pretty private already; I just thought I'd raise the question.
 
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