According to a theory, it is also said that Harutsugu was from the Kusakari clan in Chizu County, Inaba Province, and his name was recorded in a family tree of the Nakamura clan in Harima Province, which was found in recent years.
一説によれば春続は同国智頭郡の草刈氏の出身とも言われ、近年発見された播磨国の中村氏系図内にも春続の名が記されている。