No where did I assume a 1-1 correspondence between psychiatric label and neurological cause. Many disorders likely show variation precisely because they have different underlying causes....much like a car might not start for a number of reasons, including faulty wiring, bad battery, bad starter, no fuel, etc. It is also this heterogeneity of underlying causes that make precise neurological diagnosis difficult.

Nevertheless, the biggest claim is trying to claim that some behavior/symptomology/quirk does not involve the brain.