That was probably because Yoshinao ISSHIKI who belonged to the West Camp, where the Tojokira clan also belonged, was prevailing in the Mikawa Province (in 1478, Yoshinao ISSHIKI finally issued the document that expressed he abandoned Mikawa Province and retreated).
東条吉良氏と同じ西軍に属する一色義直軍が三河で優勢であったためと思われる（一色義直は文明10年（1478年）に至りようやく三河を放棄する旨、文書で表明し軍を撤収した）。