@rysiek @darnell
I did bring chromosomes into the hypothetical scenario for clearer context, yes. I did not say chromosomes define sex. They don't.
BTW, I do also think there is a valid case for some XY people to be included in female sport category. 5-ARD is just not one of these cases.
I don't think there is a singular test to clearly and unambiguously establish sex. Chromosome testing is a fairly good screen, but there can be more diagnostics needed in some rare cases (diagnostics which provide information which those people need anyway for health reasons).
Men with XX chromosomes should not be considered female, because they don't follow female development path.