When I read this part of the article...
...it reminded me of this from a while back on another thread:
And also this photo which is on one of the monuments on Ai Road in former-Iwama:
Morihei was pretty rigorous about Asagao, if you watch the old films and pictures. Kisshomaru was too, as far as I recall, although I don't remember him ever mentioning it specifically. Sometimes Kisshomaru would mention "te-gatana" - but people seem to interpret that differently than Asagao.
Saito used to complain about how "some people" held their hands, IIRC.
The background image on www.aikidosangenkai.org
is actually a photo of a kimono fabric with....an Asagao pattern.