> From another angle, I would argue that the eyes and face are part of what makes a human, as are the hands.

I also agree with this take, though in the moment at the lab I didn't interject with a critique of mind-body dualism. Either way, it seems the brain has some sort of primacy over other organs, in terms of contributing to personhood. Pretty much everything else could be lost or transplanted, yet we'd still consider someone the same person. The brain however seems essential in making you you.