General theories are that he was killed because he was taken for Yoshitoki HOJO who was Shikken (regent) but also there was another theory that he was killed because of being a 'double agent.'
一般には執権北条義時と間違えられたからとも言われているが、仲章が持つ「二重スパイ」的な立場から、彼自身が初めから襲撃の目標に含まれていたのではという説もある。