the sutemi waza of the yoseikan are all the direct inventions of Minoru Mochizuki. Some people say that he got them from gyokushin ryu jujutsu, but he never actually saw the gyokushin sutemi waza.
The sutemi in the various youtube clips popping up in this and other threads look quite judoish to me. Might there also be some people who suggest he might have learned a thing or two at the Kodokan? (Or is that just boringly obvious?)