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2. Yes, there are documented cases of people with massive cranial cavities living normal lives. https://x.com/i/status/1728796851456156136. The point isn't that they have 'just enough' brain. it's that massive structural variation doesn't preclude function, which undermines simplistic 'right atomic arrangement = consciousness' claims.
3. You're equivocating. Humans navigate maps built by other humans through language. We also directly interact with physical reality and create new maps from that interaction. LLMs only have access to the maps - they can't taste coffee, stub their toe, or run an experiment. That's the difference.