dancingalone
Grandmaster
I would be interested to review the views of the founders of the parent arts. Where might I find them?
You won't find anything too specific about 'bunkai' from the likes of 'founders' like Matsumura or Higashionna. They are long dead and they didn't leave much if any writings behind them. Their direct students like Itosu or Miyagi didn't write a lot either.
The best we can get is from several generations down through people like Funakoshi or TOGUCHI Seikichi or the various Japanese & Americans who learned from SOKEN Hohan. Or the very available western students of SHINJO Uechi-ryu. Or Mario McKenna who studies the Higashionna line of karate unfiltered through Goju-ryu/Miyagi lens.
I am sure I am leaving out a bunch of other resources, some perhaps easily found than others. I think the point is that if we want to learn the finer points and verbally transmitted details of esoteric karate, we have to seek it out in person. It's not easily wrapped up in a Black Belt magazine article for us to read, perhaps unfortunately.
Another point is that karate has many diverse perspectives given the different sources each ryu came from. Shotokan is not the only kind of karate there is though certainly it is probably the most relevant for taekwondoin. I do not believe it is universally correct to state that ALL kata applications are reverse-engineered. What Mr. Rick Clark says is not necessarily accurate for Goju-ryu or Uechi-ryu or Ryuei-ryu or Isshin-ryu, etc. when it comes to kata/bunkai or indeed anything else.