I'm not sure how she can say that, as the differences between men and women's ability to compete competitively in mma aren't really quantifiable to begin with (not by us anyway). Every individual is different anyway, so just what is "fair" becomes an impossibly vague thing to define. We celebrate the best athletes, many of whom presumably have unusual abilities which they were born with which set them apart from most other athletes. That's not really "fair," but we consider it fair, because that's how pro sports work. The question of whether or not to allow transgender fighters in combat sports is actually an extremely difficult question. No matter what the experts and authorities decide, I can guarantee that not everybody is going to be happy. I'm kind of glad it's not my responsibility to make the decision! In the end, what we don't want to see is transgendered fighters having an obvious disproportionate disadvantage in mma, so for example, if the average professional trans-gendered fighter tends to rank much much higher than other professional female fighters, this would I think be a problem, but getting enough significant data is unlikely to happen in the foreseeable future.