Shingen favored Katsuyori (in fact, he was made the lord of Takato-jo Castle at an early age) and he eventually began to wish to pass the Takeda family head position to Katsuyori and therefore planned to disinherit Yoshinobu.
信玄が勝頼を寵愛し（事実、早くから高遠城主にしている）、次第に勝頼に武田家の家督を譲りたいと願望し始めて、義信を廃嫡に追い込もうと画策した。