This is how Koshinage is done in the Iwama lineage at present, see here for example http://www.youtube.com/watch?v=QOkH7USu_yw
.Kuroiwa and Nishio were doing their own hip throws that were obviously different.
Mark Murray wrote:
6. Koshinage and tanto dori did not come from Morihei Ueshiba.
Not sure what "come from" means here but the Founder was doing this stuff since before the war.