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So is what you're saying in your first paragraph. But the thing is that there was no remarks regarding Hiruzen having the ability to smell chakra, like Kiba does. As much as we know it's the normal smell rather than chakra.Bold is just an assumption though, characters like Kiba have been known to smell chakra so it's likely Hiruzen locates his opponents by smelling their chakra as well. Muu, who extinguishes his chakra, won't be detected.
If Muu weighs down a clone then the clone will be immobile. Hiruzen doesnt know the clone is weighted. So Muu just rinses and repeats until he eventually hits the real one.
That would be true if Hiruzen can't locate Muu. I have hard time seeing someone more adapt in sensory abilities that Ohnoki will have a hard time finding Muu.