One of the reason why Retired Emperor Gotoba gave Koreyoshi a preferential treatment might have been that the retired emperor wanted to win the experienced busho (Japanese military commander) Koreyoshi over to his side, thinking of the day in which he would overthrow the Shogunate.
後鳥羽院が惟義を尊重した理由の一つに来るべき討幕の日のために歴戦の武将である惟義を味方に付けておきたいという思惑があったと考えられる。