I trained in Kyusho under a Dillman-trained instructor and found the effectiveness to be exaggerated. The ones I found to be effective were the same ones I got from military trainers. Of course Dillman went off the deep end with his “no touch knockouts “. It’s a shame he had an interesting take on martial arts and ruined it!
Though I trained Dillman for years ... I moved over to Hogan Wally Jay and Oyata some time ago