Something that caught my interest before Itachi died was his eyes. We all know that his eyes turned white when using susano. When I saw that I immediatly thought about the byakugan. I believe it was said in the manga that sharingan came from byakugan. Someone said in their theory that byakugan represents good and sharingan bad. We can notice that from the different attacks that come from each eye abililty. Neji has that circle technique which is more of a defensive move. With the Sharingan your able to read other peoples movement and engage in genjutsu which is more of an offensive advantage. This brings up the question, "Was Itachi a good guy from the start?"