Re: Baseline skillset
Well, I don't think it's outside of what I would consider...maybe it's not the purest or even best way though. From your description, it sounds as if you've found a good way to bring it into your practice. If you watch some of Gozo Shioda's demos, you'll notice how he sinks his weight into a very focused spot on the ground, kind of rebounding, adding in the "spring of the knees"...I think this combines the power of the ground with the gravitational weight of the body to produce a dramatic effect on his partner. By keeping the upper body relaxed, he transmits this power through to uke. Very simplified explanation by someone who can't do any of this very well yet.
I think Mike's approach is probably somewhat different, and I think Kancho's approach is probably more complicated than my explanation as well...