#2 SAnity
SAnity is also in limbo right now, as there's nothing left for them to do in NXT. A call-up after WrestleMania for all four members is likely.
Unlike the Authors of Pain, though, SAnity isn't a group that easily falls into a character type, and as we've seen with "Woken" Matt Hardy, the main roster doesn't have a good track record of dealing with complex characters. Their presence will be welcome in the tag team division, but it's unclear how far they'll go.
As far as Nikki Cross is concerned, she'll be a great asset to whatever division she's in. Exciting performances, particularly in extreme rules matches, are guaranteed. But with Ronda Rousey's arrival, and Asuka and Charlotte lying around, there's a ceiling she'll be unlikely to break through.
Chance of success: fair