Muzan had called every uppermoon on a meeting since some of the uppermoons had failed their tasks and ofc Muzan was angry and yelling at everyone but no one dared say a word since everyone was afraid and he was still the king of demons, so everyone had just their heads down and looked afraid, Muzan was looking at everyone and he was definitely mad and he basically yelled

"You all are useless. USLESS!"

He said and then looked at everyone except for Kokushibo since he looked much like his brother Yoriichi since he was looking down, who was, of course, dead, but Muzan still was afraid of him since he almost beheaded him, that's why he couldn't look at kokushibo since he looked pretty much like him but he wasn't that scared that he wouldn't still order him around.