Tigerwarrior
Brown Belt
I learned several of these techniques. You won't always find them in Japanese styles but you will find them in almost 100% of Okinawa styles. I learned them from 2 people one was a student of one of mitoses 1st generation students and the other was a villari guy who was a high level Dan ranking. The mitose guy had more of these techniques and more variations. They are not really secret techniques but they are hidden in plain sight. I learned more of these type of techniques from the mitose guy. Which makes sense because James learned these when he was a kid from Okinawa styles I think. The options are endless for you If I remember correctly you are a issin ryu guy and alot of the masters from Okinawa have knowledge on these type of things. Some of the strikes and blocks have multiple applications like pulling someone into your punch. The techniques I learned were almost all grappling or grab techniques and 1 striking block, a block for a knee from the clinch the same technique as the X block in the video. Alot of them were set ups for tripping someone or escaping holds. You can find this stuff alot in kosho ryu kempo and it's related arts such as mitoses kempo jiu jitsu and yoshitsune combat ju jitsu. I've also heard they train some of these in goju ryu. Hope this helped I'm a bit out of my element as me not being a karate guy but just wanted to share I've seen stuff like this before.