Kishi can make sharingan the weakest bloodline limit if he wants. inorder for him to do that he can introduce a new more powerful bloodline, and I said in future not now. It could be a new bloodline that someone came up with. for all i can tell u it could cancel out all other bloodline limits with few other twists. and sasuke is weak, if not then why is he going to oro? I like sai, wut he said about sasuke is all true and i hope they do fight each other.