The expulsion of Yoriie was not just a conspiracy, but was apparently caused by pent-up discontent within the samurai in Togoku (the eastern part of Japan, particularly Kanto region) which contributed to the circumstances of the bakufu acting against the Shogunal dictator.
頼家排斥は北条氏の陰謀のみではなく、幕府成立の起動力となった東国武士達の、将軍独裁への鬱積した不満が背景にあったと思われる。