That's interesting. Katori shinto ryu was founded in the middle of the 15th century, one of the oldest Japanese schools. If they are the "originals", their staff technique may be where some of the jo techniques came from. Muso Gonnosuke, who was said to have been inspired to create the jo techniques after his defeat by Miyamoto Musashi, was a student of the shinto school.

http://en.wikipedia.org/wiki/Tenshin_Shoden_Katori_Shinto-ryu

http://en.wikipedia.org/wiki/Jo_(weapon)