I am convinced that a very substantial portion of skull growth/development is just not sex hormone linked. Hence, why so many of these women look just very subtly off and why so many child-troons end up with these huge skulls or ogre-jaws. This happens even when they aren't subjected to the insane 4 year puberty blocker delay, like Jaron/Jazz was on E at 12.5yo and likely had his height stunted 'properly' as a consequence but still seems like he's going to end up with a real blocky looking head and that Emily Tressa guy was on E pretty young as well and his skull is nowhere near typical for a woman.
This probably has a lot to do with it:
View attachment 1748439
Of course, not all child-troons etc. will end up with huge skulls and neither Jaron/Jazz or Kim Petra look
that weird, only obsessives will actually really notice this shit but it's the nature of normal distributions that when one distribution has slightly higher mean then the ratios between the distributions will blow up in the tails. So, if you were slated to have an above average head at birth and then got trooned out by mommy then unfortunately you get left with an implausibly giant head.