It can be verified with various diaries and letters that after the formation of the Satsuma-Choshu alliance, he acted to develop friendship between them further and was on good terms with Takayoshi KIDO, Yajiro SHINAGAWA and so on.
薩長同盟後は、さらに両藩の親和のために活動し、木戸孝允、品川弥二郎などと交際を重ねていたことが、種々の日記、書簡などで確認される。