It is thought that the previous head of the clan was either Yoshiari ISSHIKI (not to be confused with Yoshimichi's son), who as a descendant of Yoshitsura ISSHIKI was of eldest son lineage, or the illegitimate (possibly a blood relative of Yoshiyuki) Yoshikiyo ISSHIKI (not to be confused with Yoshiyuki's son) but because records are scarce, Isshiki clan movements around the time Yoshiyuki took over as head clansman are not clear.
先代の当主は一色氏嫡流（一色義貫の末裔）の一色義有（義道の子とは別人）か庶流（義幸の血族か）の一色義清（子の義清とは別人）と思われるが、記録が乏しいため義幸が当主に就任した前後の時代の一色氏の動向ははっきりしない。