Since Iemitsu was attached to Kasuga no tsubone rather than his real mother, it can be thought that Sugen-in treated Tadanaga preferentially to prevent Kasuga no tsubone from enlarging her power, thus, it is not necessarily appropriate to criticize Go.
家光が実母より春日局になついていた事もあり、春日局の権力拡大を止めるため忠長を重んじていたとも考えられるので、一概には江を批判できない。