There is a similar explanation about his birth in the sixth "alternate writing" of the Kamiumi no dan, Nihonshoki, and Iwatsutsu no onokami was alleged to be an ancestor of Futsunushi no kami.
日本書紀同段の第六の一書も同様で、ここでは磐筒男神は経津主神の祖であると記されている。