Agreed. Though in this case this was about strategy. My point was that it’s not in the system if the student has to figure it out. That doesn’t mean it doesn’t fit or belong, but that the instructor left it out. So in this usage, I’m referring to the system delivered to the student by that instructor, not the larger System (or art).I think it depends on how the system is being defined. Seems to me that a lot of people define the system by the body of techniques. I don’t think that’s the best way. I think a better way is to define the principles, with a body of techniques that help illustrate how the principles are put to use. That leaves the door wide open to have room for any technique, as long as it can fit within the principles. I like to say: even something that isn’t a “proper” technique at all can find a place within the system as an individual may use it.
So then, is “it” in the system or not, meaning a particular technique? Yes, if it fits within the principles, because you can do anything you want with the system, even if not explicitly taught by the teacher.