Monday was a multi-technique night, and we revisited koshi nage for a time. We started with the Sankyo and that lead into koshi nage. The clip is doesn't start quite the same as Monday but the first half of the clip demonstrates the basic idea. The last half shows a variation from we did NOT practice Monday.
From a beginner's view there are a number of landmarks in Aikdo (aka obstacles) and koshi nage is one of them. Here is my current list
1. Backward roll
2. Forward roll
4. Koshi nage
The first two are relatively easy to handle adequately. The second two are real demarcations of note. After a few weeks most people can get by with 1 & 2, but 3 & 4 may take a while (years?) to be able to perform adequately.
So far after a year and a half I can fake 1 & 2 and "get by" with the others as long as nobody looks closely. Neither 3 or 4 hurt as uke but I'm still a fat middle aged guy who makes a lot of noise when I land. And THAT can be a scary sound.