We already seen Ronda not get the armbar. Everyone forgets Tate got thrown and armbared just like everyone else in the opening minute and she got out. Ronda didn't even sweat it she threw her again opened her up with some ground and pound and then finished. So it's not like Ronda has never had to go past her first option.
That's the thing. It's not the armbar. It's the hip too BEFORE the armbar. The one where Rousey winds up in side control.
You CAN defend that.
Rousey has two Olympic medals, but not two GOLD medals. Rousey's a better athlete. But defending judo throws is technical. Carmouche COULD have learned how, but HAS she?