It is unknown whether there was actually a feud between Oshio and Uchiyama, but it is said that there is a letter to Uchiyama which was sent by Oshio in 1831 in Josen-ji Temple in Moriguchi City, Osaka Prefecture.
大塩と内山との間に実際に確執があったのかどうかは不明だが、文政13年（1831年）に大塩が内山に宛てた書簡が大阪府守口市盛泉寺に残されているとのこと。