Did you even read the manga?
He had the Sharingan before fighting his brother, it was stated that he had inherited his fathers genes and had a powerful Doujutsu.
That's why he though he was entitled to being the Sage's heir.
It was shown that he had PS and Sharingan before they fought, even before the Sage died.
You clearly have no idea what you are talking about.
He had the Sharingan before fighting his brother, it was stated that he had inherited his fathers genes and had a powerful Doujutsu.
That's why he though he was entitled to being the Sage's heir.
It was shown that he had PS and Sharingan before they fought, even before the Sage died.
You clearly have no idea what you are talking about.