I think it is more of a limiter on Sarada's eyes before she awakens a OP doujutsu. Remember how Obito always had problems with his eyes but in the end awakened Kamui. Something similar could happen to Sarada.
Maybe. Or Karin is the real mom :snick:

There was a chance to see what an Uchiha and Uzumaki could produce, but it was passed for a garbage fanservice pairing that's shipped by a horde of preppy retards, so Kishi could make him some money off of it. We got three Uzumaki-Senju (Kawaki, Nagato, and Tsunade).
Could you imagine how OP a kid who is born of Uzumaki-Uchiha would be? The kid would be blessed with an Uzumaki strong body and chakras while possessing the Sharingan.