http://www.tsuki-kage.com/mpegs/ganseki_otoshi.mpg
Above is another example of doing this waza. I suggest you use google and compare notes with the different versions that are out there. This waza has been discussed many times on many different boards, and the google search will highlight these. There are also clips from Saito Sensei of the Iwama dojo (sadly no longer with us).
In my mind, the comparison with different versions will yield much more information than any critisism I might have.
Best,
Ron