I wont be really specific, but .....She could be a girl. The only reason why she looks like a guy is because she has a lot of natural Testosterone, which is a male hormone. Women have testosterone, but in very little amounts, they tend to have more oestrogen. I think that Caster is just one of the girls with more testosterone. People should leave her alone!
I have a lot of natural Testosterone and it doesn't make me talk like a man. Neither do I dress like a man. Let's hope that she is indeed a female because if she is otherwise it is going to be disgraceful for RSA sports. Look at her crotch area and you will also see something very different from us female lol