Re: Baseline skillset
I think the real question is how do you get from the basics ("your body pivots around the big toe of your front foot") to the explosive power release that we see Morihei and Shioda doing in response to a shove from uke? They do it so sharp and hard that it's way above what you see even from a "run of the mill" 6th dan.
Mike talks about store-and-release tricks with the toe. What are those? Do Iwama ryu or ASU teach that? I am not aware of Saito making a similar statement about the big toe as power source.