This was probably caused by the fact that Tomomasa HIRAGA, Maki no kata's son-in-law, made an ungrounded accusation against Shigeyasu, and she brought this accusation she had heard to Tokimasa.
これは娘婿に当たる平賀朝雅が重保のことを牧の方に讒言し、それを聞いた牧の方が時政に讒訴したためであると言われている。