Naritsuna (Moritsuna)'s uncle, Masatsugu, identified himself as OIKAWA, whereupon Naritsuna and the Masatsugu bloodline flourished in Oshu, but later it went to ruin and consequently the Naritsuna bloodline flourished instead of this.
成綱（＝盛綱）の叔父・政嗣も成綱に従って及川を称し、この政嗣の系統が先に奥州において栄えたがのちに滅亡し、以後は成綱の系統がこれに代わって栄えた。