This is considered as a byproduct due to the fact that, as seen in the territorial dispute with the Takeda clan, the power of the Unno clan expanded greatly in the generation of Yukiuji, and that they became scattered in various parts of the country.
これは、上述の武田氏との領土争いに見られるように、海野氏の勢力は幸氏の代に急拡大し、海野一族が各地に散っていった事による副産物との見方がされている。