"In that case, should we not notify the Jiutian Dangmo Sect?"
Originally, according to their plan, after killing Kong Lingling, they would try to control the demonic beast, and if they couldn't, they would report the matter to the Jiutian Dangmo Sect.
Because the evidence was conclusive, the Snow-blowing Palace definitely could not dissociate itself from the matter.
Once the Snow-blowing Palace was eradicated, their Fourth Grade Spirit Vein and medium-sized spirit stone mine would have to be taken over by the Five Elements Sect.
But once the Jiutian Dangmo Sect got involved, the Demonic Sacred Embryo would certainly not survive.
"Senior brother, junior brother, why not let me take care of it for a few years first? If it's truly wild and untamable, then we can report the matter."