I got a question. What in your opinion was originally jo?
It seems obvious: it is just a stick! But are you sure?
There are some people, who claim that jo was originally a short spear. It could be a true because of some reasons.
Yesterday I read an article by Meik Skoss http://koryu.com/library/mskoss7.html
who told the story of Muso Gonnosuke Katsuyoshi. After losing a duel with M. Musashi Muso cut his long staff to a short (126 cm) stick, called jo and developed jojutsu.
Now I please somebody well informed to help me: jo was always a jo or was originally a spear?