#1 To take the fall if WWE wants to protect Rousey

WWE treats pinfalls and submissions very seriously. They are even very keen to protect wrestlers from such defeats. That is one of the primary reasons why multi-man matches and interesting stipulations like the Ladder match and the Tables match are so prevalent in the modern day. WWE may be looking forward to protecting Ronda Rousey, even though the former UFC champion could be taking a hiatus from WWE after Wrestlemania 35.
Thus, if WWE wants to have a title change without asking Rousey to concede the pinfall or submission, adding a despised heel is the best alternative to it. Even though she is one of the best performers in WWE, Charlotte Flair is one of the most booed women on the roster at the moment, due to receiving relentless title opportunities.
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Becky could end the night by making Flair tap out, giving her the moment she deserves and protecting Rousey at the same time.