In The End It Is Always Kokyunage
KOKYUNAGE 呼吸投げ Breath throw. A cover-all term used to refer to a series of blending techniques with no common mechanical similarities
Saturday: Sensei worked us through some ushiro techniques starting with ushiro tekubitori (wrist grab from behind) and kokyunage and toward the end we worked on responding to kubishime (choke hold from behind) where I think we responded with Sankyo but stopped the kubishime after that.
After class I mentioned to Sensei that I thought he was leading us up to koshi nage. He admitted he thought about it as it is logical progression, but he decided to emphasize something else. He went on to say that you would use koshinage only if kokyonage was not an option. Then he dispensed this gem (to paraphrase)
“In the end it is always kokyunage”
He said you really only go (this is very much a paraphrase) with koshi nage when you must align yourself with uke to apply a technique but in a more pure approach kokyu nage would happen naturally and no such drastic maneuvers are needed. Then he pointed out that while strength is not a major part of koshinage it still takes more out of you than kokynage. He amended his cool aphorism allowing what you really want is the most appropriate technique for the specifics of the moment, but I think he meant that if you are aware you could generally position yourself so some kokyunage would be the easiest.
I don't think he meant this to be a special comment to me (the oldest person in the class) but he explained that when young you can use your strength with many techniques but as you age you are forced into wisdom since strength is not the option it once was, and that the goal is wisdom.
The second technique in the video above has an example of a the kokyunage we practice on Saturday, although when Sidney does it it is way smoother and way cooler.