The main reasons were that Harunaga was a foster brother to Yodo-dono and Mitsunari was from Omi Province, where the first home of Yodo-dono, the Asai family governed and Yodo-dono highly valued his brilliant mind.
治長は淀殿と乳兄弟であったことや三成は淀殿の生家浅井氏の治めた近江出身でその才気を淀殿に買われていたといわれることなどがその主な理由である。