#2 To not necessarily have Charlotte and Becky become best friends
I know that Becky Lynch teams up with Charlotte Flair to take on Sasha Banks and Bayley in a tag team contest for the SmackDown premiere on FOX. And yet, as cool as it would be, I don't want Becky Lynch and Charlotte Flair to become a permanent pairing simply because there's so much equity in having the two women face off against one another. They are two legendary rivals, even if they are best of friends when the cameras aren't rolling.
And Carmella is a good substitute in a sense because she's uncharted territory in a way, and fits into this rivalry because of her relationship with Bayley back in NXT. BayMella was an actual thing and something that the fans used to love dearly. With Charlotte Flair, she's out to remind Bayley that she used to be someone good but now has transformed into someone that she never thought that she would.
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In a sense, it's great for WWE to dredge up stuff from NXT because a lot of fans have grown up following their journey from the said brand. And new viewers may just be curious enough to check NXT out on USA. Charlotte and Becky will also almost certainly be split up during the upcoming WWE draft.