Kodokan Judo, at the beginning was mainly Tenshin-Shinyo Ryu and Kito Ryu techniques (although there were others). However, there was a competiton with Fusen Ryu c. 1900 with Mataemon Tanabe's school. They stomped the kodokan judoka, mainly because they were specialists in newaza. After that time - Kano had a group of judoka who spent alot of time with Tanabe and became "experts" in newaza. Certain techniques were incorporated into the Kodokan repetoire. The Kosen group, however continued to specialize in newaza. Judo was a term that was used by Jikishin-Ryu, and others for a hundred years or so. It was a descriptor - way of yielding, implying it had a higher purpose than just self defense (jujutsu).
Russ St. Hilaire
Kobukai Jujutsu