My point was that it is totally unnecessary. People should be taught how to do it and how to undo it from the onset so that the ability to apply it on a junior is negligible and largely controlled by the junior who can just stand there looking at a senior. Then co-operation in practice takes on real meaning.
This stuff -how to negate and control- is not advanced, it is basic level aiki. Were students to be actually taught how to creat aiki in aikido, then they can start to actively take part in an early phase of their training and everyone can grow in aiiki together. Anything other than that is just seniors showing off.
The idea is not to condition them to pain to toughen them, but rather to give them the tools to stop you...dead in your own tracks for God sake...gees.
So Yonkyo is no longer unbearable it becomes totally managable. Shiatsu is not needed-education is needed. Maybe I should do a "students only" seminar focusing on how to help correct some of this taking advantage behavior.
Cheers
Dan