But I have realized during the past year that certain methodologies of teaching can REALLY only function under very direct supervision, as in, one-on-one private teaching. Without someone who can just stand there for, well, hours and literally dissect your body top to bottom from the outside and do it again and again, it is probably going to be all but impossible transmit certain ideas, not intellectually, but into the body. That is the difficulty, not in the concepts, but in the implementation.
I haven't had more than three students in one Aiki weapons class, and I know with certainty I wouldn't be able to give the depth of individual attention conducive to learning with more, even four students would be pushing it. This isn't to say larger class sizes aren't productive but teachers and future teachers need instruction with only one or two peers at most for a significant portion of their class training if they're to make real progress.