This is a video of Nishio Sensei, almost certainly from one of the Aiki News Friendship Demonstrations from the 1980's. Stan Prannin is narrating so it's definitely Aiki News video.
There is a lot of the typical good stuff, but the koshi nages were pretty rare by the time I got there in the 1990's. The average age was in the 40's - 50's with some people up into their 70's in classes regularly. They can't afford to take such falls, so these became pretty rare during regular classes.
Most of the time when he would demonstrate koshi nage he would take his moving foot in front of the supporting foot and he would step out and away before turning back to uke. I thought this was the norm, but I had terrible trouble with my foot going behind my supporting foot. As I started to understand more about the throw, once or twice I did notice his foot went behind his supporting foot and he came out facing down on uke. When I realized either way was OK, I was able to relax and start to send the moving foot the direction I desired it to go.
This koshi nage is quite different from the normal Iwama and (I think) the normal Hombu style hip throw. When uke is loaded in Nishio Sensei's form, uke's body is supported at first, then you have the feeling that the floor dropped out from under you and you flip and end up on the mat.
What is happening is, the hip away from uke drops away as the moving foot, the foot away from uke, moves across past the foot that is in between uke's feet.
It takes practice, but this can become a very fast throw. In the manner that Sensei is demonstrating in this video, uke is powerless. with both hands held and he is just along for the ride. It's a fun ride as long as you land OK.
The koshi nages show up at about 3 minutes.
The uke at that time is Yasuhiko Takemori Sensei. I trained with him on Thursday nights when Nishio Sensei was not there and on Sunday evenings regularly and also Iaido from him on Saturday mornings in Anjin Zuka when the Independence was in port. He is at least 7th dan maybe 8th dan now in Iaido. Here's the youtube video site:
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