I have some friends that trained in Kuniba's Goshindo in the 80's and from what I know (which is limited), Mr. Kuniba used his understanding of Karate, Jujutsu and Aikido to form "kata" that taught these defense moves to people in the US in the 70's. He called it "Goshin Budo". He later honed it down to 5 kata and called it "Goshindo". There seems to be a distinct difference between the folks that learned the 70's Goshin Budo and the later 80's generation of Goshindo. I have been told that the earlier "Goshin Budo" seemed to be more "hard-line" Jujutsu / Karate Bunkai type training and the later "Goshindo" training was more "Aiki-like". I can't swear by all of this but this is what I have been told. Hope it helps.
Darrell Collins
Nippon Kobudo Rengokai