You could pretty much consider Ronda defeating Alexa Bliss and taking her revenge at Summerslam a lock and while I do agree that this donesn't necessarily have the "big fight" feel, the only reason they will go ahead and book this match is to do the spot with Alexa Bliss seemingly have her hand broken, being she is double jointed....
I'm pretty sure that's the goal and, in all fairness, it will be a pretty good visual, not to mention it would put the arm bar even more over...