Because he showed his reluctance or gave Kondo critical comments against Kondo's lavish expenditure for his women as the person responsible for to control expenses of the group, which led to Kawai's being purged.
近藤の度重なる女性関係の浪費に、隊費管理の責任者として難色や苦言を呈したために、排除対象人物とされ、粛清に進展した、という説。