Ziska, an interesting point regarding the formal ‘bow’ or ‘seiza’ and the correct way of execution.
I had always been taught to kneel in a way which left my sword drawing hand free at all times, this is usually the right hand, therefore, the left knee would touch the floor first from the semi-kneeling position, then the right knee into ‘seiza’. The left hand would then be placed on the floor followed by the right hand to ‘rei. The right hand would then be raised back on to the thigh, followed by the left. To stand, the right knee would first be lifted to the semi-kneeling position, followed by the left, allowing you able to attack and/or defend at all times.
I thought that this was ‘universal’ and derived from the Japanese Samurai and Zen attitudes until I read your post, which started me thinking;
In Michael Finn’s book ‘Iaido, The way of the sword’ (1982) he describes the proper way of ‘seiza’ and ‘rei’ as I have done above, so too does Master Otake (Katori Shinto Ryu) in his study of Iaido in the book ‘The Way of the Warrior’ (1983) by Howard Reid and Michael Croucher.
For un-armed arts, this same method is described (in detail) in the ‘Aikido’ section of ‘Martial Arts of the Orient’ (1975) The Hamlyn Publishing Group Ltd.
At the 1987 J.K.A All Japan Championship (VHS), this same method of ‘seiza’ and ‘rei’ is again seen during the demonstrations by Asai Sensei and Tanaka Sensei.
Having studied the Kawasoe tape that you mentioned, indeed, Sensei does place his right knee down first; but, he places his left hand down first to bow, and removes his right hand first back to his thigh. To stand, Sensei raises his right knee first from a semi-kneeling position followed by his left.
I can only wonder.