- Remember Travis? For all-out fighting, a somewhat different skull shape is more useful--one that has projecting jaws and attachment points for muscles strong enough to bite off someone's face. He could hit, and kick, but also bite.
- We've had a couple of concussions in the family (fall, auto collision). If the average hominid skull took so many blows that it would evolve some stronger structures, why wouldn't it also evolve a few cushions inside the skull to keep the brain from rattling around so much? They'd be just as useful--maybe more so. Such would certainly have saved us some trouble.
Color me dubious. Very dubious.