As rat mentioned in his comment to the previous post, kotegaeshi seems to occur much more often in randori than does kote mawashi (nikkyo). Tomiki noticed the same thing as he was putting his fundamentals kata together. He originally thought there would be roughly fifteen techniques (including kotemawashi and kotegaeshi), but through a period of randori it must have occurred to him that people just don't put themselves into mawashi-type situations as much as they go for gaeshi-type positions. He didn't discard mawashi, but his next version of that same fundamentals kata included seventeen techniques and did include kotegaeshi but not mawashi. We have found through the years that kotegaeshi and wakigatame (gokyo) are probably the two most commonly occurring locking techniques in randori. Resistant ukes seem to always be pushing into wakigatame or snatching their arms back into gaeshi. because these two techniques transition into each other so much, we work a good bit on flowing between them in chain #3.
Stay tuned for some discussion about the nature and use of locking techniques in general and kotegaeshi in particular.