Although these conditions lead to a custom of Sadaijin managing Daijokan in place of Daijo-daijin, later on when FUJIWARA no Yoshifusa and FUJIWARA no Mototsune served as both Daijo-daijin and Sessho (regent), there arose some confusion as to the difference in the duties of Daijo-daijin and Sessho, and who would control Daijokan when there were both Daijo-daijin and Sadaijin at the same time.
こうした事情より、太政大臣に代わって左大臣が太政官を統括する慣例が生じたが、後に藤原良房及び藤原基経が太政大臣と摂政を兼ねると、太政大臣と摂政の職掌の違いは何か、あるいは太政大臣と左大臣が並存する場合にはどちらが太政官を統括するかで混乱が生じた。