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Zoro doesn't need his brain... Observation haki is a sixth sense meaning you can still do things even if the other 5 senses are gone or manipulatedThe thing you showed zoro wasn't even using it, and just because he has doesn't mean he's good at it, and genjutsu affects your brain so its debatble as to wether or not he would even be able to move his physicall body instead of his astral body that would be inside of the genjutsu.
Literally fighting with no head