alt Hacker NewsYour first example is someone without a cerebellum which is not like the others.
The other examples are people with compressed neural tissue but that is not the same as never having the tissue.
A being with only a cerebellum could not behave like a human.
You're right - I mixed up cerebellum/cerebrum/cortex terminology. My bad. The cases I'm referencing are hydrocephalus patients with severely compressed cerebral tissue who maintained normal cognitive function. The point about structural variation not precluding consciousness stands.