Thanks to Chris for a VERY thought provoking blog entry...
I just wanted to point out that John Stevens's book Budo Secrets contains text from Ki-ichi Hogen. The selection in Stevens's book is longer (in English) than what Chris included in his blog, but I don't know how different the two texts are in Japanese. In his very short intro to this section, Stevens writes that "These teachings have been widely employed by martial arts instructors over the centuries and are still in use. Morihei Ueshiba, the founder of Aikido, often quoted from this list when teaching and demonstrating Aikido techniques, and so did my Aikido teacher Rinjiro Shirata."
FWIW and just to elaborate a bit; In the early eighties Tamura sensei did teach Aikido while explaining Hogen's scroll of the tiger. He showed how to apply the ideas/principles and explained how O Sensei often quoted the scroll of the tiger.
Shigenobu Okumura translated the text in English and published it somewhere in the eighties (if I remember correctly) in the newsletter of Hombu dojo "The Aikido".