The reason they refused is because they feared that after extracting Tao Siran, their dividends would not increase but decrease.
However, their refusal was of no use, as Gu Xiao's character has always been like this once he made a decision.
When he says it's this, it's this; when he says it's that, it's that.
Later, seeing that the relationship between Tao Siran and Gu Xiao was very good, not just superficial but genuinely good, they supported Tao Siran because they believed Gu Xiao wasn't abandoning the Gu Family, but rather shifting to the background.
As for Gu Ershu's family, they were not considered at all.
This family had a bad reputation in Beijing, typical of those who squander their wealth.
However, when it came to murder, in uncertain conditions, they did suspect them, but now she is one hundred percent sure that the things Ershu said about the Gu father and son were purely fabricated.