There is no real reason Rose should be that big of a fav. And I don't think she should be favourite at all.
Wasn't that lucky, Wik. The tempo she set up was starting to get to Rose. Jess mixed in bodypunches and legkicks that visibly slowed down Rose and made possible for her wide swings to sneak through. She was going to knock out Rose sooner or later, despite her atrocious technique. She is a little tank with endless gastank. You gotta match her in physicality and/or cardio to beat her (both Joanna and Weili are bigger than Rose). I think the same will happen again. Unless Rose can somehow finish Jessica early, but I can't bet on that.