In 1573, after Shingen died and Katsuyori assumed leadership of the Takeda clan, Okudaira Sadamasa walked his men out of Tsukude Castle and rejoined the Tokugawa.

[3] Tokugawa allowed Nobumasa to marry his eldest daughter, Kamehime ; and he was given Nagashino Castle.

Oda Nobunaga was so impressed by the Okudaira's performance in the battle that he offered Sadamasa the honor of adopting part of his name—Nobu.

[5] When Nobumasa completed his service as Kyoto shoshidai in 1601, he was transferred to Kanō Domain in Mino Province.

In 1614, he outlived Tadamasa and even the first son Okudaira Iemasa in Utsunomiya Domain at Shimotsuke Province, in 1615 the following year he died.