Although Nariakira and Tadanori superficially contended with each other for the family estate of the Shimazu clan, it can be said that Tadanori was only put up by the anti-Nariakira group and that their personal relationship had not been so bad consistently.
島津氏家督の座を争うかたちにはなったが、忠教自身は反斉彬派に担がれたという要素が強く、斉彬と忠教の個人的関係は一貫して悪くなかったとみられる。