From Aikido Journal-This scroll was entitled, "Bojutsu Masakatsu Agatsu" — True Victor is Self-Victory. Clint George, one of Hikitsuchi's closest students, told me that the "Shingu bojutsu" had five levels:
Ikkyo — a fundamental solo form
Nikyo — a solo form that explored circular movement
Sankyo — a solo form that explored three dimensional, spherical movement
Yonkyo —Jiyuwaza — free, un-choreographed movement
Gokyo — Misogi no bo — a form that included techniques from the previous sets as well as those which had ritual, spiritual significance
So, if I understand this correctly, O-Sensei taught jo to simulate spear and bayonet techniques, and then awarded a bo system to a single student. Where did this system come from?