Nice try, but no cigar. Prenatal or neonatal exposure to estrogen results in masculinization (Dr. Richard Whalen, UC Irvine) just as perinatal exposure to testosterone results in the same outcome, masculinization (Drs. Beach, Noble and Orndoff UC Berkeley). These results have been replicated and verified. The absence of exposure to gonadal hormones allows for the development of feminine characteristics, regardless of genotype.
Exactly right, it's the presence of androgens or MIS that differentiate the internal ducts and external genitalia. What our "scientist" mysterio doesn't understand is if there is abnormal androgen or MIS production it would affect the gonadal ridges causing ambiguous genitalia and abnormal sex differentiation which has NOTHING to do with the brain (hypothalamus).