It seems that Masamune planned to organize allied forces of territorial lords of Oshu led by Date clan, and then the forces would cooperate with Gohojo clan, while he also anticipated and waited for the rise of seditious groups within the Toyotomi administration such as Ieyasu TOKUGAWA.
また、伊達家を中心に奥州の諸大名の連合軍を組織し後北条氏と連携、徳川家康ら豊臣家中の不穏分子の蜂起を待つという構想も持っていたようだ。