Ienobu had absolute confidence in Shinmi because he was adopted and raised by him, but Ota and Shimada became jealous of Shinmi and brought a false charge against him, telling the bakufu that Sakon had died young and Shinmi replaced his own child with Sakon.
新見は家宣の育ての父であり、さらに養父であったことから家宣の信任が厚く、それを嫉妬した太田・島田らが幕府に対して「左近は早世しており、新見が自らの子を左近として擁立した」と讒訴した。