Just my quick impressions:
- The "good" examples seem pretty well done on the part of both uke and nage.
- The "bad" examples seem pretty badly done on the part of both uke and nage (uke does not continue to react once they are grabbed and nage just hauls them down).
- There are WAY more than 2 good ways to do kotegaeshi and 2 bad ways.
- As instructors, we have to teach the technique one step at a time. Sometimes with beginners this means just trying to get the correct hand position and working on the correct body movement another day.
It's a very interesting web page, and it made me think, but the conclusions are over-simplified.