In addition, it is also suspected that the leaders of the bakufu might have conspired it under the instruction of Hiroko KONOE (Tenei-in) who was the legal wife of Ienobu TOKUGAWA or Gekkoin who was the biological mother of Ietsugu.
さらに徳川家宣の正室・近衛熙子、あるいは家継生母・月光院の操作による幕閣の陰謀もあったのではないかとも言われている。