However, which of the schools should be included in Roku-ryu is not established, and there is a theory that includes Hokuin-ryu and Jisonin-ryu in the lineage of Kannonin-ryu and Ninna-goryu.
しかし、六流に属する法流は一定しておらず、観音院流・仁和御流系の北院流・慈尊院流などを入れる説もある。