[slopinthebag]

Well, I think the "brain as an antenna" theory is also plausible given your preconditions.

But I think my issue with the emergence theory is that it seems to imply to me that consciousness is non-physical and non-local. So what entity is actually experiencing the consciousness? It's not that I believe consciousness is physical and local, but people who make the emergence argument seem to believe it is and I can't figure out how that is supposed to work.

[doctoboggan]

Why would emergence imply anything about non-physicality and non-locality? Temperature is a another common example of an emergent phenomena. An individual atom doesn't really have a temperature, only a large group of them do. But you wouldn't say temperature is non-physical and non-local, would you?

[davrosthedalek]

I am not sure, but I think you might misunderstand what emergent means. Take chaotic systems, in the math sense. Chaos is a well defined property of, say, iterated dynamic systems.

A linear dynamic, say x_n+1=lambda x_n, or x_n+1=(1-x_n), is never chaotic. But if you multiply them, x_n+1=lambda x_n (1-x_n), it depends on lambda if the system is chaotic.

None of the components are chaotic. But for specific combinations, chaos emerges as an property.

In physics, the mass of mesons and the nucleon is emergent. It's completely different from the constituents' mass. Different from an atom, where its mass is very close to the mass of its nucleus and its electrons.