Board Thread:Naruto Discussions/@comment-26567684-20150819061606/@comment-24949460-20150819165803

But the facts stack up in favor of her being Karin's daughter(through science):

1. No birth certificate

2. No marriage photos

3. Creating life with only using DNA

4. Glasses

5. Secret of her birth

6. Karin knowing EXACTLY when Sarada would need new glasses without so much as checking her

7. No flashback that shows a pregnant Sakura

8. No physical connection between them(no green eyes or pink hair or large forehead)

9. Nature vs Nurture thing

10. Naruto's important flashback about how even when one is not blood related they can still be considered family.

All this and more proves that something happened to change Kishimoto's mind.