@Ritchie Another big evidence would be If we find a case of someone who had a horizontal face and suffered an accident or a disease that altered his facial structure and his receding hairline advanced or he started thinning with an intact hairline after that. I say receding hairline because people with bad galeas always have a receded hairlines even If they have excellent craniofacial development. I couldn't find one but of course I found people who were born with scull or facial abnormalities and I found really astonishing cases
I found pics of men with untreated hydrocephalus. This is a condition that makes an infant's brain abnormally big because of too much fluid. Of course the brain has no space to expand and this results in an expanded galea.
Just look
@Ritchie
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And of course they have receded hairlines.
But the most interesting case is this man from India.
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He was born with an enormous galea and odd face shape. Just look how thin his horseshoe is and the pattern his hairline was receding. The tension on his galea must be insane.