As she demonstrated with her historic win over Liz Carmouche, Ronda Rousey has given women’s fighting in UFC main events complete legitimacy. She may be the most dominant female fighter on the planet, and is awaiting her next challenger.
If Rousey has any say in the matter, that next challenger will not be Fallon Fox.
Rousey has said that she would face Fox if UFC asked her to, but it would probably not be her first choice. Or second. Or 11th. It has nothing to do with Rousey being afraid to take on Fox. This is a competitor who would likely take on all female challengers.
The problem here is that Fox has not always been a female.