That is a rather ridiculous statement on Ronda's part. I mean Tate could def probably take Cain but I am not sure Ronda's armbars would work on Cain.
Anyways though I spoke once with my friend about Ronda. Could I, a 180 lb man, at the time 205, beat Ronda in a grappling match or MMA fight. If she came in lean at 135 and I came in lean at 170 both with our current skill set. I have some boxing and wrestling skill and I know a few submissions. My wrestling is by far the best aspect of my game but I am by no means near an olympic level the way Ronda is with her judo.
My only advantages are size and strength that come with being a man. Her grappling skills are probably way better then mine.
I used to think there would be no way Ronda could beat me. Not trying to sound cocky or anything. Now though I no longer feel that way. I feel like this topic has been discussed before. Essentially it is semi-trained man vs slightly/maybe more then slightly smaller in size trained female.
On a related note I have to admit Chris Santos would fuck my day up if I ever had to fight her. That much us indisputable.