As Yoshikatsu had distinguished himself during the Osaka Natsu no Jin (Summer Siege of Osaka), he was appointed permanent Karo (chief retainer) of Nagashige ASANO (the great-grandfather of Naganori ASANO and lord of Kasama Domain and the Hitachi Province Makabe), the third son of Nagamasa ASANO.
良勝は、大坂夏の陣での戦功が著しかったため、浅野長政の三男浅野長重（長矩の曽祖父で常陸国真壁・笠間藩主）の永代家老に取り立てられる。