Consciousness and self-consciousness are two different concepts, but the way you wrote your post seems to imply a sort of fluid movement between the two notions which obscures the idea you're trying to express (at least from my angle).

How can "consciousness" confer any survival benefit? A philosophical zombie and a conscious being would survive at exactly the same rate in principle.

Philosophical zombies are beings who mimic conscious beings but do not experience the world. First person experience confers no survival benefit. Third personhood is the body. The me you can point to.

Animals have a disconnect between their first person and third person view of the world. Animals have consciousness, first person experience of the world, but the intellectual connection between their consciousness and their body is absent. There is no concept of "you" for an animal.

First personhood is consciousness. Third personhood is material, bodily, self extension. Second personhood is the intellectual connection between the first and third person, the "you." Animals have no concept of you which can promote moral behavior (you should do x, applying it to all)- they have only an I and a me. I want this, so I'll do x. This will be best for me, so I'll do this.

Me is the self I can point to. "That's me." I am the one who can think. You are who I speak to when I speak to myself. It is who one is (oneself made real by one's self). One's identity. When I say, "come on marthman" I'm speaking to myself, the you within me. The you mediates between I and me. It is no one but yourself who mediates between who you are (I), and what you are (me). What are you? I am me. Who are you? I am the one who is speaking to you. Who is this you?

Only humans have the second person that one can interact with intellectually, which completes one's trinity of perspective (just like God).

One, you, me. One is the first person. You, oneself, the one I am talking to, is the second person. One's self, me, is third person. That's me, or this is me- referal to the self in third person. Intellectual talk to oneself, talking to oneself, that's a human activity. As I write this I can talk to or speak with "myself" (one may speak with oneself) but not "my self" (i.e. my body).