Nobody but nobody really understands how the human brain works. It 90% phospholipid. Just how those fats chrn up there and create complex human thoughts and insights is the science of the new millennium. Obviously this man like a few precious others had unique and rare circuits that made his insights possible. Perhaps if civilization survives and advances one day humans may come to understand the physiology of thought.
Have considered that the tissue mass is not the source of the insights, merely the facilitator of the soul / body connections?