Largely I find your points reductionist and insulting to the very sacred experience that is unfolding for you and me. Consciousness is a primary or even a priori phenomenon from which all of your surmisals stem. You have got it backwards. The fact someone once saw an ape, or saw a nebula, or made a measurement of brain waves, these all had to happen within human-experience. The experiencing itself is irreducible. Consciousness as a byproduct or secondary phenomenon as you claim, is to be expected for someone brought up in the modern era where religion and spirituality were so vehemently eschewed that men leaned too far into the other extreme and became physicalist-materialists claiming the lived experience is but a mere symphony of neurological interactions without consequence. This is a disastrous view. This is basically a swift ticket to a hell-realm. The basic posture is all wrong - you must return to the fundamental facts, namely those of your lived experience. What you claim as primary evidence are in fact secondary observations. And then you use the secondary observations to make claims about a primary nature "out there" and "distinct from" human-experiencing. This is simply not the case. This view is logically untenable. One does not study consciousness by looking at pictures and drawings and photos, just like how one does not study what music sounds like by inspecting the buttons of a saxaphone unblown. The fluid nature of the energetic capacity of mind is very difficult to discern - it's not an everyday occurence, sages spend their whole lives pursuing prayer and meditation in order to catch a mere glimpse at the primal nature of experience. Everything else flows from this. Your mind is the root of all things, it is the common denominator in all moments of your experience.