Can’t say that I totaly agree with your numbers but Egyptians are without a doubt under represented and Romans are over represented.
I would also expect some traders, caravan operators and caravan guards from Arabia Felix, Nubia, Kush, Parthia etc. at the market in Alexandria and maybe a few Galatians mercenaries.
Have you found any signs of judaism? I didn’t noticed any.
And please remember the unicorn.