A few notes:
Merely to ask Horgan's question: 'How do minds arise from the material nature of the brain?' is an unwarranted assumption (mistake). Who says that minds arise from the brain? Before asking 'how', ask the question "do minds arise...?" Make sure your preconceptions are true before you do your research.
Koch is, and Crick was, hopelessly lost on this issue. (See the latter's Astonishing Hypothesis. He was a fanatical materialist. Koch also seems to be a bad case.)
There is nothing wrong with the concept of panpsychism, if we start from Koch's perspective. What's wrong with it is that it doesn't go far enough.
I wrote about that here:
Koch is looking for the most parsimonious theory to understand consciousness. In his world 'parsimonious' will mean one that fits within a materialist scientific paradigm.
Consciousness is not “a system property that emerged”, not “just physics”. More unsubstantiated and unwarranted conclusions. I wrote about emergence recently here:
https://graham-pemberton.medium.com/can-god-emerge-from-a-material-universe-7b48c17b7a9d
When he says “IIT says it’s part and parcel of the universe”, he means of course the material universe, not the universe in its hierarchical entirety.
Jung was indeed the key to understanding all this. Dismissing him is folly.
Premonitions, guidance etc. suggest that the brain is not responsible for consciousness.
The problem with inner voices is that we have various subpersonalities, autonomous complexes. In the case of Carl Jung personalities 1 and 2. If we choose to be guided by an inner voice, we have to be certain that it is the voice of the Higher Self. (You mention Crabtree, who is definitely someone worth listening to. If you're not already aware of his book Multiple Man, I think you would find it interesting.)
No one suggests that schizophrenics should listen to their inner voices when they say 'kill yourself', or 'murder prostitutes'.
