There it is, good analysis on why Ronda's armbar setup and execution is in a different league.
That wasn't even the vid I wanted to post, though it was also complimentary of her abilities. I edited my original post to include both, but here's the one I was going for:
[YT]MWJWFgo_jD4[/YT]
At around the 24:30 mark, they explain that she modified her leg positioning to prevent the escape that Miesha had used in the first round, and instead squeezed her legs to stay tight. Miesha's escape technique no longer worked and she was forced to tap.
"It's very unique like, I already said it publicly, but her armbars are some of the best I've ever felt in my entire life, and it's almost like Ronda has a, um, magnetic, um, something inside her hips. A magnetic force that is attracted to shoulderblades. That's the way I look at it."
"For most people, a failed submission is discouraging. But for Ronda, it's educational. It's research. So when Miesha survived the first one, Ronda already knew how the defense would come next time."
I'm not arguing over who has a better armbar. I'm just saying that Ronda is also very good at it.