There is another theory that since Sadatsugu was not fortunate to have his own child, he adopted a child from the Nariyasu clan, who had power in Hiranogo next to Kyuho-ji Temple in Kawachi Province.
また、定次に実子ができなかったために、河内国の久宝寺の隣の平野郷の有力者であった成安氏から養子を迎えたとする説を唱える者もいる。