I was wondering.. if you attempt a Kotegaishi on an uke that has locked his wrist, is there a way to loosen his wrist and still use this technique?
One of my instructors, Tony Graziano Sensei (4th Dan), explained an interesting point relating to Kotegaeshi. If you picture Uke's "Ikkyo Curve" in your mind (the curved line between Uke's two outer shoulder points running across Uke's back), then picture that line extending out from the shoulders. As you apply your Kotegaeshi, turn the hand and move it on that line. It's unbelievable how much more effective Uke's compliance will be. It works especially well on a highly resistant Uke!