#3 Kairi Sane and Candice LaRae
If Io Shirai is slated to be a big player going forward for NXT, and she should, then perhaps Sane debuts with Candice LeRae as her partner instead. Both women have been touring with the SmackDown brand at live events, perhaps in order to get ready for the main roster.
They both were also participants in both the 2019 Women's Royal Rumble and the Women's WrestleMania Battle Royal this year. LeRae is already someone who doesn't need much seasoning in NXT and her role lately has been doting wife in support of her husband.
While it's nice to see her support Johnny Wrestling, they need to let her start to shine on her own in matches. Sane doesn't need any more seasoning in NXT and LeRae could do most of the talking for the duo. Both women are also extremely popular with the audience. If their was one team that would make the most sense, it would be this one.