Mochiyo initially respected the contents of the will due to the orders from the bakufu (Japanese feudal government headed by a shogun), but soon deposed Mochimori with the support of the local samurai) and took over the position at the head of the family and all territories of the Ouchi clan.
幕命もあって持世は当初、これに従ったが、やがて国人衆の支持を背景にして持盛を滅ぼし、家督と大内氏の領土全てを相続するに至ったのである。