It is believed that Tamenobu, hearing that Hideyoshi, Hidetsugu HASHIBA and Nobukatsu ODA all enjoyed falconry, sent them some falconine (a specialty of Tsugaru) to gain their affection as an acquaintance, which supposedly contributed to the approval of his main domain.
これには、秀吉、羽柴秀次、織田信雄の三名とも鷹狩りを好んだことを聞きつけた為信が、津軽特産の鷹を贈って友誼を結んだことも本領安堵に繋がったと見られている。