However, some cast doubt upon his governing Miyagi County while others consider that the family governed the County but the family after the generation of Tanemichi did not move to the Mutsu Province.
しかし、そもそも胤通が宮城郡を領有したことを疑う説があり、領有までは認めても胤通以下の惣領家が移住したとは考えない説もある。