The "Koyo Gunkan" (record of the military exploits of the Takeda family, compiled by one of the Takeda's vassal and completed in 1616 by Kagenori OBATA) quotes Shingen TAKEDA to his successor, Katsuyori TAKEDA, in his last moment, 'Kenshin is a busho having a strong sense of duty, he will never abandon the people if he is counted on. Trust him after I die.'
また、武田信玄は死に臨んで跡継ぎの武田勝頼に「謙信は義理がたい武将なので、人に頼られれば決して見捨てる事はない。自分の死後は謙信を頼れ」と遺言したと甲陽軍鑑にある。