and he left no understandable frame of reference, hence, nobody really having what he had.
Right, the frame of reference is missing to understand what they are emulating.
What O'sensi demonstrated for his students was like being given a book written in Spanish. If you already know how to read Spanish you can understand the book.
If you know Italian or Latin or any of the Romance languages then you may be able to understand the book a little bit.
If you don't know language except English you won't understand the book at all.