According to various reliable materials, at the Siege of Osaka, he was invited by Katsunari MIZUNO as an honored guest, and served Katsunari's oldest son Katsusige MIZUNO (later changed his name to Katsutoshi) and played a very active part in the Tokugawa forces (the enemy of the Toyotomi forces).
実際は水野勝成の客将として徳川方に参陣し、勝成の嫡子・勝重（のち水野勝俊）付で活躍したことが数々の資料から裏付けられている。