Living as a woman, and taking female hormones would put Michelle Dumaresq at a severe disadvantage if she were to compete against men.

Having been born and reared as a man may give her an advantage when competing against women.

Should she be barred from all competition because she had the surgery? Or should she only compete agaiinst people who can beat her?

There was never an issue about Michelle Dumaresq competing as a woman until she started to win.

I think the issues here are pretty complex. The fact that most of us have deeply negative gut reactions to the very thought of sexual reassignment surgery only confuses issues more.