There are particularly extensive descriptions related to Nigihayahi (child of Tenjin (god of heaven)), the Soshin (ancestor honored as god) of the Mononobe clan, which led to opinions that the text were extracted from a Mononobe document, a document that no longer exists.
また、物部氏の祖神であるニギハヤヒ（にぎはやひのみこと）に関する独自の記述が特に多く、現存しない物部文献からの引用ではないかと考える意見もある。