However, whether I have misinterpreted the fun part there the point is it is very real to some the spiritual discipline, the Ki discipline he is using. It is very soft in it's execution to the doer, nothing to do with body mechanics but purely to do with extending Ki and weight underside. Such was his way and his spiritual emphasis.
Very effective by demonstration, very 'unstoppable' A good example of a way which doesn't mean to say that other ways cannot do similar.
I enjoyed your post overall, but have clipped and emphasised one small part, to disagree with, however, I may well be missing your point.
It is my understanding that extending ki and weight underside has a great deal to do with body mechanics. Although they are both mental in their origin, the correct body mechanics must be in place as the vehicle to allow the mind stuff to happen to proper effect. In effect the body must be relaxed, in balance, all movement coming from the centre.
I completely agree with you that the execution is very soft in it's execution, but for this to happen the mind has to have the correct body to back it up. This is particularly apparent when trying to teach the type of aikido that we both do. How many times have you had students who are trying to execute a technique, with softness, with extension, without struggle, but without the desired effect. They may even feed back that everything in their mind is towards that goal, but their body is scuppering their attempt. They engage shoulders when not neccessary, they hold tension in places they are not aware of, they hold their weight in the wrong place, their hands are not connected to centre, their co-ordination is not as complete as it needs to be.
I know you know all this, so it may well be me getting the wrong end of the stick, I don't want to be teaching granny any egg sucking here!