I remembered that other quote from Mochizuki but couldn't find it (readily) online
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It's not surprising that he'd make that comment, I believe that he had training in Katori Shinto Ryu.
In Morihei Ueshiba's aikido, uke does not do the overhand chop in basic techniques. Tori initiates with a metsubushi strike to the face, which leaves uke in the position where ikkyo can be applied. Morihiro Saito spent his life teaching it that way and some gave him crap with the whole "there's no attack in aikido" mantra. Then someone once brought him a technical instruction manual realised under the founder's supervision, where the technique was done Saito's way. As you could imagine, he was beaming, and from then on he'd bring the book with him at seminars and show people, like "see? I'm not making that up!".
I've seen ippondori (a DR technique resembling aikido's ikkyo) done against a downward sword strike in a DR video. However, both DR and aikido techniques are done (and taught) empty handed. Ueshiba had no formal training in weapons (apart from his bayonet training while in service, and he was very good at it) and there's no record of him ever fighting someone while being armed himself.
The weapons retention theory is most likely a rationalisation by later generations to explain why their techniques don't work in hand-to-hand combat.
I think that it's true that most aikidoka today couldn't make it work without experience in the styles you cited. I also think that, historically, this was not the case. World class martial arts practitioners (Kenshiro Abbe, Minoru Mochizuki, Shoji Nishio, Kenji Tomiki, etc.) went to study under Ueshiba whose only significant training was "aikido" (that is, DR). Plus, among Ueshiba's famous "fighters", several had little to no previous martial arts experience (people like Tohei and Shioda had done some judo in highschool, while Tadashi Abe started aikido at 16 with no experience, for example).
Given that Ueshiba and his students gained pretty impressive functional ability from their aikido training, it's worth asking oneself what they were doing differently. Ellis Amdur provides some interesting leads here:
Great Aikido —Aikido Greats – 古現武道
This is a good way to understand the techniques from an external perspective and pinpoint similarities. Yet, without a solid technical foundation (gained through extensive training under a good teacher, and ideally supported by technical material from all-time greats) you'll likely miss the
why of the movements. I also feel that solid historical knowledge about the art is useful to avoid baseless interpretations (like the weapons retention argument above).
In order to understand aikido, one has to understand fundamental principles like irimi:
“Irimi,” by Ellis Amdur – Aikido Journal
Anyway, if you want to analyse aikido techniques that are as close to their original form as possible (although aikido is not about technique) I recommend looking at the Iwama (under Morihiro Saito) and Yoshinkan (under Gozo Shioda) lines of aikido. They are all-time authorities in terms of technique (although in his later years Shioda's demos shifted from techniques to body principles, which is actually good in terms of aikido).
Shioda could also pop your head out of alignment to make you fall, daito-ryu style (the whole video is good in terms of body movement, but the moment I've just mentioned is around the 2.40 mark):
Yep, it's in daito ryu. We also have it from the back:
Unfortunately, these techniques are trained less and less. I've never done ganseki otoshi because nobody in the dojo would be able to take the fall.
Agreed. According to the art's founder, aikido's purpose is "takemusu aiki" or spontaneous martial technique. Yet, aikido is one of the less spontaneous existing martial arts (and this also goes for lines like Iwama style that purports to stick closely to the founder's teachings). I see a fundamental contradiction here.
Uncommitted attacks are not limited to a sportive environment. Anyone who knows what he's doing will not unbalance himself in a fight, it would be stupid to do so. Yet, aikido was able to deal with trained martial artists at some point in history. So, what happened?
Agreed,
although at some point the student should take responsibility for his own training and try to find what's missing, because most teachers won't.
Sick pictures! Do you have the source?
Yep, although I suspect there were more didactic reasons for this, like conditioning uke's body by folding him like a pretzel, and making him feel that he's not being overcome through power.