Thank you for that elaboration.

I definitely believe in point 1 (emergent property). As a bit of an asterisk though I don't think that it's a property that necessarily must emerge from a sufficiently complex system. More of an evolutionary accident than anything else.

However, as far as larger and more complex entities developing consciousness, I think that should is probably an overstatement. I'm open to could develop an emergent property similar to consciousness but then the question becomes what evidence do we have for what? What predictions could we use to test that idea?

Edit: on second thought I'm probably being a little imprecise with "could develop...". I don't know whether those systems could or could not develop consciousness because to the best of my knowledge there isn't any significant evidence about their ability, in one way or another.