>>280866309Yes, but not because of the useless LMs. His biggest fuckup was Nakime. Most demons only create combat abilities and struggle to fight demon slayers, individually none of them matter at all to Muzan and do nothing that he couldn't do if he wasn't so lazy and afraid of sword jesus. The only fucking demon in a thousand years to make a useful ability for Muzan was Nakime, and when he finally rewards her for it she creates ANOTHER useful ability to find exactly what Muzan wants. She is literally more useful than UM 1-3, even if the entire UM group were still alive she would be more important than all 6 of them combined.
Muzan leaves her alone and vulnerable. She's #4 on paper but her not good for combat. She gets captured and turned against him, then he has to kill her because he was so fucking stupid. If Muzan actually obtained immortaility, Nakime is the one demon he would guaranteed let live.