The source describes accusative usage after khalā and ʿadā as the majority analysis.
«جَاءَنِي الْقَوْمُ خَلَا زَيْدًا»
al-qawmu is the subject of jāʾa. On the verbal analysis, khalā is an exception verb and Zaydan is its accusative direct object.
The meaning resembles illā Zaydan, but the grammatical governance differs.