Rojo-
If this is a major publication I urge you to do a couple of things. This is an important fight and wether you like it or not, your name and stance is going to become part of the record on this now.
1. I would ask to write the companion essay. It can be short, but she is calling you a mouth breathing bigot and you should show readers that you have a stance that isn't bigoted or cruel. In fact, you worry about women's sports.
2. At the very least, I would highlight on the site the stance that you previously quoted from your article last year (for new readers). In your comment to the writer I'd note that you encourage readers to come read more about your thoughts and engage.
3. Emphasize sensitivity repeatedly. You're sensitive to Caster and Chand, their rights and feelings, BUT...
4. You need to reframe the argument that this is a fight for women's sports. A line has to be drawn somewhere. You simply believe that chromosomes or testosterone levels, etc etc etc. A number of commenters have posted that (and I agree with their thoughts) many of these articles fundamentally argue that not allowing her to compete is just unfair to her. It would be sad, but it is also unfair to the other women that have spent their lives training for a chance to compete at an Olympic games.
* People that throw the word bigot around these days annoy me to no end. Bigot is defined as a person who is utterly intolerant of any differing creed, belief, or opinion. It seems like 99% of the time the person throwing around the term bigot is actually the more bigoted one. Case in point: one of the authors posted here has a twitter feed that expresses her intolerance of any differing opinion.