After the death of influential Ieyasu TOKUGAWA, Sadakatsu was well-respected by Ieyasu's nephew, Shogun Hidetada TOKUGAWA, but he firmly refused his offer to be a chamberlain in July, 1623.
大御所徳川家康の薨後、甥である将軍・徳川秀忠から篤く敬われ、同9年（1623年）7月、将軍秀忠より侍従職を進められるも固辞。