I wrote a blog post comparing aikido koshinage and judo koshi waza a while ago. Some of the comments and links are interesting. In the article I mentioned hearing Nishio Sensei explain how he personally introduced judo-style koshinage into aikido. I got the impression he had been asked to. I don't do koshinage with feet together or in a T. I do it with feet in a figure 11. The same as O Sensei, Arikawa Sensei, Nishio Sensei, Sugano Sensei, Shimizu Sensei...
koshinage koshi waza hip throw