I'm wondering since we haven't seen Karin yet in this Gaiden, is she dead? And has there been confirmation on when Sasuke and Sakura married? Cause I'm wondering if Sasuke and Karin had Sarada, Karin died in childbirth and then Sasuke returned to the village where Sakura agreed to raise Sarada as her own, and Sasuke then married Sakura to keep the ruse going.
Pretty much sure that Karin is alive. Suigetsu did say that she's just in a different hideout and warned him to not touch her things.
Im betting that when Karin shows up the joke will be put on her. And they will make it apppear as if its funny that people were under a false notion that she was the mother.