It was because there was a gap in the social status between the Takeda family, Kai no Shugo (the provincial constable of Kai Province), and the Nagao family, Echigo no Shugodai (deputy of Shugo (provincial constable) of Echigo Province).
これは甲斐守護の武田家と越後守護代の長尾家の格式の差による。