Koretoki ASO reassumed the role of head of the clan after Korenao died, but in the Northern Court, Magokumamaru SAKANASHI, an illegitimate child of Koretoki, was appointed to the head of the clan, causing the Aso clan to split.
惟直の死を受けて阿蘇惟時が当主に復帰するが、北朝(日本)方は惟時の庶子・坂梨孫熊丸を当主に擁立し、阿蘇氏は分裂した。