Very much appreciated. I take that as the utmost compliment.
Good question, and yes it's a problem of the Masters of those Arts having died without passing on how to teach such techniques. Instructors like myself and others can dig for the Historical uses, and even surmise the exact philosophy behind them in order to preserve their use, but that's a tough task which takes a lot of time. Time we dont get compensated for. We have to do this on our personal time.
In an ideal World the pay structures for Coaches would be different. The Russians and Cubans were able to do so much in so little time because of subsidization. In other words they didnt need to worry much about marketing themselves or what happens if only 8 students a day show up, their salaries were guaranteed. So their job, if no student showed up, could be to research and come up with innovative ideas for their Sport.
Most Coaches in the US cannot do this because they work full time jobs and Coach on the side. And I'm not making an argument for outright communism, what I'm saying is that when people get paid a living wage to do something they're passionate about, that's when you get the best results. One of my goals is to change the normal pay structures for Coaches in boxing, and to get people who want to put money in the Sport to put it in the right places. If that happens you'll definitely see a revival of lost techniques, because we have the time and security to venture to find them.
I can teach certain unorthodox styles, but nowadays my main concern is comfort and safety in the ring before I give a fighter specific uniqueness. So it takes longer. I used to give the uniqueness up front, but that didnt do a ton to alleviate performance anxiety.