According to "Bunoshokudan." Hidetada and others who favored Tadanaga and Fuku felt it was dangerous to disinherit Takechiyo and appealed to Ieyasu in Sunpu, but Ieyasu, who was anxious over the struggle, made the elders first rule absolute, making Iemitsu the definite heir.
『武野燭談』に拠れば、秀忠らは忠長を寵愛しており、竹千代廃嫡の危機を感じた福は駿府の家康に実情を訴え、憂慮した祖父・家康が長幼の序を明確にし、家光の世継決定が確定したと言われる。