Well, once you know some of the rationale behind single-person katas, you can work some things out for yourself. They are really meant for you to find out for yourself what's there by doing them and thinking about the purpose of the movements.
There is so much the master can tell you, but the art is for you to work it out for yourself. If you take a good kata and work on it by yourself for ten years, really diligently, you'll develop your own understanding. Of course, that's assuming you do kihon practice and kumite along with the kata practice.
Best to all.
Thats the kind of thing I would want to avoid in training, I think that kind of training is not the most effective way to train if your sole purpose is becoming better at fighting, I think that way is outdated.
Why learn blocks that are not really a block but a throw, a grab,etc when I can just learn a throw,a grab or a block(I understand some moves can clearly do multiple things like a strike that can also block, but putting aside that for the moment). If the tradition did not exist of doing things like that, would the idea even be given the slightest bit of thought? If no one had come up training that way, then heard of it after the fact, would they consider showing that to there students? If as the example given above mentioned two people use trial and error to find the best training methodology, would that be part of the result?
Many martial arts in the past were very secretive so they often keep things obscure on purpose, but now things have gotten beyond that point(mostly at least).