Matsumoto Castle, by the way, was only a Takeda possession for about 20-odd years. It was originally built by the Ogasawara in 1505. They held it until the Takeda took it in 1549. After the Takeda got their butts kicked (Shingen's son and heir Katsuyori was nowhere near as brilliant a general as his father; in fact, he was relatively inept) the castle went to a variety of different owners.
Randomly, while researching when Sanjou-no-kata died (1570, or some three years before Shingen), I noticed that her and Shingen's eldest daughter married Hojo Ujimasa. Ujimasa is Saburou Kagetora's eldest brother -- you know, the one who, in MoB, thought that sticking his little brother's soul into a tree was a good idea? Yeah, him. Sengoku Japan quickly becomes a very, very small world.