Not to mention that "bone structure" is not a fixed thing. The last 100 years or so, western skulls have seen a reduction in the size of jaw bones and sinuses,

Not to mention that "bone structure" is not a fixed thing. The last 100 years or so, western skulls have seen a reduction in the size of jaw bones and sinuses, smaller mouths, narrower palates, etc. Apparently because we spend less time chewing on tough foods.