While the Kyushu dynasty theory doesn't have a direct relationship with "Tsugaru Sangun-shi," some people say that the Kyushu dynasty theory, too was a fallacy in that FURUTA regarded the phrase, 'King Iwai is from the family line of Yamadai Kingdom in Chikushi' from "Tsugaru Sangun-shi" backing up the Kyushu dynasty theory.
本来本説と同書に関する議論とは直接的な関係はないものの、古田が同書の一節「磐井王は筑紫の邪馬壹之系なり」を本説の補強に考えていたこともあり、本説をも誤謬であると断ずる声もあがった。