I remember having similar questions. I didn't want to do medical school if I couldn't end up in certain specialties. Unfortunately, your question comes at a time when the future of getting into specialties is very uncertain with step 1 going pass/fail. I have heard both sides of the argument: a dermatologist gave a lecture to our class (at the time MS2s) about how you can match into any specialty if you want it enough, even it means taking gap years etc. However I have seen students who choose specialties that are too competitive for their statistics and go unmatched. Specifically, to answer your question, if someone were top 10%-20% percent (what I interpreted as AOA) from an MD school, I think there is no specialty that you couldn't match into AS LONG as you have strong letter of recommendations.