Ohayo gozaimasu, doshi --
When I was at the Yamaguchi dojo in Nishi Ogikubo in the mid 70s I observed Gogen Hanshi performing this kata. Upon inquiry I was told he devised it from the two, Sanchin and Tensho.
My source, at that time, may not have been aware of any influence by Yagi sensei. I was also told that no one else was allowed to practice it.
-- Duane Sammons
"No matter what happens,
no matter how difficult
or impenetrable things may seem,
Just keep training
and you will find the truth."
-- Teruyuki Okazaki