(A likely explanation is that Masayuki was appointed to the post of tairo or the official post of the shogun's guardian, but this is not applicable to the case of shinpan daimyo becoming a cabinet official of the shogunate, because the Hoshina family, which became the Aizu-Matsudaira family later, was not a shinpan yet at that time.)
（正之は大老またはきちんとした役職としての将軍後見役に任じられていたという説もあるが、この時点では保科家＝後の会津松平家は親藩ではなく未だ譜代扱いなので、親藩大名が幕府要職につく例には当たらない）。