I apologize if someone has already brought this up - I skipped to the end after reading the first two pages and had an epiphany of my own:
What about the chromosomes? If this "Starchild" was the product of an alien father and a human mother, surely the number of chromosomes would be
different. Even in humans that positively have two human parents, we see the number of chromosomes differing from the norm with genetic abnormalities
like Down's Syndrome. I would think that in a creature whose mtDNA is as different as is being claimed, then the chromosomes would also be affected
in a MAJOR way.
***Three hours after writing the above bit***
After googling all night, and brushing up on my microbiology, I have come to the conclusion that there is no way to determine the number of
chromosomes that were present in this skull. I am leaning towards a totally terrestrial condition such as progeria or hydrocephaly to provide the
explanation for the shape of this skull.
Thanks for the gray matter workout though. I'd forgotten how much I'd forgotten about microbiology since college.