Steel Tiger
Senior Master
All four volumes present interesting and often persuasive accounts of the optimal oyo for the Pinan/Heians... and they're all different, at times very markedly so. I'm not a relativist in this domain; I don't think any given bunkai result is as good as any other; but there's at least a year's worth of serious research to be done in comparing just these four proposed bunkai sets and testing them out experimentally, under seriously realistic conditions (which is the only way we're going to get any useful assessment of how they stack up against each other, IMO). And there are many very experienced karateka and Tang Soo Doists on MT who probably have still different stories on how the Pinan/Heian/Pyung Ahns are best interpreted for realistic combat use.
The fact is, kata have depth. They keep their own counsel, so to speak, and you have to go to them, learn them and think hard about just what it is you're doing when you perform them, if you want to derive any benefit from them. They reward sustained study, and unlike an engineering textbook which has the answers to selected problems in the back, you aren't guaranteed anything that you don't test out for yourself.
I have singled out these two quotes because they resonate very strongly with me. The simple fact that there can be so many different interpretations of the same movements is vital to the understanding of kata. My own experience is in CMA, Daoist CMA at that, where the concept of the uncarved block was drummed into me. With this concept one does not give to a movement a single interpretation, but one lets different interpretations flow from the specifics of the situation.
The fact that you can actually do this with kata is an indication of their depth. Without that mysterious depth such a thing would not be possible. i think that this is why so many 'new' kata look kind of lame when compared to older, traditional ones. Modern creators have not put the thought into the process of invention that the old masters did. They are standing on the shoulders of giants and it shows.