It is thought that it was because Ono made Okajima very angry when he found out that Tsuneki OKAJIMA's retainers stole money under this confusion happening in Ako and questioned Okajima thinking 'he must have been a part of this crime.'
赤穂藩改易騒ぎのどさくさで岡島常樹の部下の小役人たちが金銀を盗んで逃げだした事件を捉えて、大野が「岡島も一味に違いない」と吹聴し、岡島が激高したのが直接の原因だったともいわれる。