I mean let's just make this clean:
IF Karin would be truly Sarada's mother, WHY THE HELL SHOULD IT BE A SECRET?!
I mean Karin is not Uchiha Madara or Otsutsuki Kaguya who tried to destroy the entire world, not even the leader of an Akatsuki terrorist group, just an overrated fodder who was under the level of Sakura + she was losing againts Spiral Zetsu AND the reason why Spiral Zetsu didn't killed her was because she was saved by Suigetsu and Orochimaru.
Honestly, hiding Sarada's father identity could make sense as Sasuke did horrbile things. But Karin?
So that's why I don't think that Karin has anything to do because hiding her identity makes no sense at all, Sakura, Shizune or anyone could tell this to Sarada anytime!
Further, seemingly not even Shizune know anything about Karin, meaning if Karin would be the mother Shizune could tell it - remember, Shizune told to the council Tsunade's plan to sending Naruto after Orochimaru in Sasuke & Sai Arc, so if Shizune "betrayed" Tsunade she could the same right now.
So I don't see the point of this "hidding Karin's identity", as:
1.Karin was never such a criminal as Orochimaru, Sasuke or Obito were.
2.If she gave birth to Sarada then Shizune could easily tell it or even Sakura.
So, I don't see the point of this.
IF Karin would be truly Sarada's mother, WHY THE HELL SHOULD IT BE A SECRET?!
I mean Karin is not Uchiha Madara or Otsutsuki Kaguya who tried to destroy the entire world, not even the leader of an Akatsuki terrorist group, just an overrated fodder who was under the level of Sakura + she was losing againts Spiral Zetsu AND the reason why Spiral Zetsu didn't killed her was because she was saved by Suigetsu and Orochimaru.
Honestly, hiding Sarada's father identity could make sense as Sasuke did horrbile things. But Karin?
So that's why I don't think that Karin has anything to do because hiding her identity makes no sense at all, Sakura, Shizune or anyone could tell this to Sarada anytime!
Further, seemingly not even Shizune know anything about Karin, meaning if Karin would be the mother Shizune could tell it - remember, Shizune told to the council Tsunade's plan to sending Naruto after Orochimaru in Sasuke & Sai Arc, so if Shizune "betrayed" Tsunade she could the same right now.
So I don't see the point of this "hidding Karin's identity", as:
1.Karin was never such a criminal as Orochimaru, Sasuke or Obito were.
2.If she gave birth to Sarada then Shizune could easily tell it or even Sakura.
So, I don't see the point of this.