Clear homage to Zatoichi, exactly like the Blind Justice nikana stance in Warframe. It's a pretty distinctive style. I would not complain at all if they do this more with Kanan.

Filoni said it represents something that has been seen on Clone Wars before, i’m thinking something like the three beings from the Mortis arc. Maybe it is the spirits of the Father, Son and Daughter merged forming a true balanced force being.