I strongly suspect the IOC signed-off on Dr McKinnon for fear of being labelled an 'obe' or whatever is fashionable this week.
All you need in Dr Mckinnon's case to know 'she' has gained an unfair advantage, is a set of eyes and a modicum of common sense.
As we now have this absurd situation that men can compete against women, to the detriment of women athletes, what we need is:
1. Men compete against men.
2. Women compete against women.
3. Men who are transitioning to women compete against men or other men who are transitioning to be women.
Point 3 is there because it is fundamentally unfair that men (to all intents and purposes) are allowed to compete against women.
Quite simply there is not an argument in the world that can justify a man, transitioning to be a woman, being allowed to compete against women.
Taking my Mako Vunipola point to the extreme, no amount of oestrogen (sp) will make him a woman. He may grow a pair of tits, but his body composition will always be that of man, and a bloody big man at that.