>
> I'd also like to know the historical importance of them, again
> within a
> Wado context.
>
Hi Brian,
I'd suggest reading this article by Reg Kear on Wadoworld:
http://wadoworld.com/technical/ohyo/ohyo.html
While it may not offer an answer to all your questions, it will at
least clarify a few issues.
Kear sensei lurks in the background. But he may perhaps be pursuaded
to answer some additional questions you may have after reading his
piece.
Igor A.