Baron, For me, this is the the telling answer. "It is all body" doesn't establish physicalness as fundamental – it assumes the very thing that needs to be established. It's an all too common mindset-driven statement. We know there's something to explain. The question is what it comes from, and physicalness and consciousness are the two obvious candidates to pursue.

But until either concept has been established as fundamental beyond reasonable doubt, we cannot require the assumption of one, (e.g. physicalness), to be the starting point for considering the other.

Consciousness could be fundamental, and operating with an entirely different set of parameters. That prescribes what and how we need to investigate, rather than deciding the answer before we start.