Owing to Shinagawa and Aoki from Choshu Domain, Tosuke was highly recognized and treated well by the members of the Choshu faction such as Takayoshi KIDO, Aritomo YAMAGATA, and Hirobumi ITO.
長州藩出身の品川・青木の仲介により、木戸孝允・山縣有朋・伊藤博文ら長州閥の知遇を得た。