Even those who support the view that the family moved to the Mutsu Province do not entirely believe in the genealogical tables as reliable resources, there still remains suspicions that some details of the genealogical table may have been made up during compilation.
胤通の移住を肯定的にみる説でも、系図に信頼をおいているわけではないので、やはり詳しい事績が系図編纂中に作られたという可能性は否定できない。