Yagyu Hyogonosuke Toshitoshi, studied Yagyu Shinkage Ryu under his grandfather the second head master Yagyu Sekishusai Munetoshi who became the disciple of the founder of Shinkage Ryu, Kamiizumi Nobutsuna(who at the time was named Kamiizumi Isenokami Fujiwara Hidetsuna). Yagyu Hyogonosuke Toshitoshi became the third head master. He served the Owari Tokugawa family and founded the Owari Yagyu family line. His son, Renya, (the same one I referenced earlier) redirected the application of Shinkage Ryus principles for the new Era and became the 5th headmaster. From that time on, the line of Yagyu Shinkage Ryu has been under the direction of the Owari branch of the Yagyu family. The branch that still provide the headmaster and the only school that makes use of the Yagyu Owari koshirae I was talking about Yagyu "gyaku-oki". So yep, we are on the same page

Great school, the current (22nd) headmaster, Yagyu Koichi has been starting to revitalize that branch. Last I heard there is no Owari school in the US as the only person authorized by the pevious headmaster to teach others in the US has actually moved to China to teach but I understand the new headmaster is training another American with the purpose of him returning to teach here. The Edo school does have classes in the US in a couple places Philadelphia and NY I believe.