Re: Old O'Sensei video.
It is interesting to compare the 2 videos. I have only skimmed through them so far, but it is particularly interesting to see the early Tohei vid because you can see the habits that pervade Ki aikido now, but you can also see some stuff that Ki aikido dojos seem to teach less often now. For example, have a look at the slow ikkyo movements from 15:00 and compare them to Saito sensei, for example. I would say there is not a huge difference there, apart from the initial direction that he moves in. Then watch him speed them up, and you get something completely different.