The difference between drop Seoi-Nage & Seoi-Otoshi is fundamentally whether
or not you lift or pull down your opponent. The hand, foot or knee positions
are irrelevant. It is still an Otoshi if you come in for a normal Seoi-Nage,
meet resistance and drop onto your knees, squat or whatever, providing that
at no time of actual Kake do you lift.The opposite is also true your
original Tsukuri can be created by dropping down but if at any stage you
lift your opponent to make the throw, it reverts back to Seoi-Nage.
Kuzushi is the initial breaking of the balance or posture in order to make
him susceptible to an attack. Both Seoi- Nage and Seoi-Otoshi require the
same Kuzushi, I.E. Mamae-no-Kuzushi ( front breaking of posture).
I think perhaps you may be confusing Kuzushi (breaking of the posture) this
is fundamentally concerned with direction I.E where you are taking your
opponent, with Tsukuri (creating the technique), this is how you break the
balance, what your hands, feet & body are doing to break the balance in that
direction.
I hope you consider my answer and look forward to possible discussion,
Ray.

"Jigotai" <jigo@ono.com> wrote in message
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> "R Hunziker" <rmhunziker@hotmail.com> escribi