#6 Bayley and Sasha Banks

The first-ever Women's Tag Team champions have spent their entire main-roster careers as members of the Raw roster.
That one fact alone is part of the reason why a move to SmackDown would benefit both them and the WWE.
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Provided that they are still champions after WrestleMania, they can still come through on their promise to defend the titles across all of WWE's brands.
It also means that when and if they do lose the titles, they can feud with many women on SmackDown that they might not have feuded with.
They both faced Asuka, but it all changed once the Empress of Tomorrow challenged Charlotte Flair for the SmackDown Women's Title last year.
She lost, but she remained a member of SmackDown. Is Becky Lynch going to remain a member of Raw if she loses at 'Mania? What about Flair?
Neither of the Boss 'n Hug Connection has feuded with Lynch, so if Lynch someone wins the Raw Title and then moves back to SmackDown, it would open up the possibility for both women to feud with Lynch.