Nah, whatever damage has been done is already set in motion. Chisora seems fine with taking it so why should we care?
As I said earlier...what are gonna do? I like the guy and wish he'd quit. He doesn't give a bucket of warm **** about my opinion.
I wish you were right but to my understanding the brain gets hurt by inertia - hitting the walls of the skull from the inside. The fist/glove doesn't directly comes in contact with the brain anyway, so unless it breaks the skull, the thickness of it doesn't matter. Strong neck muscles (slowing down the movement of a punched head) and rolling with punches should help protect the brain. Nothing else, I think.