It is said that the real intention of Nobushige who entered Osaka Castle tempted by Toyotomi Clan whose defeat was almost obvious was to show the military renown of Sanada to the world by frustrating Ieyasu TOKUGAWA, not in order to gain Onsho (reward grants) or recover his family name.
敗色濃厚な豊臣氏の誘いに乗って大坂城に入った信繁の真意は、恩賞や家名回復ではなく、徳川家康に一泡吹かせてもって真田の武名を天下に示す事だったと言われている。