all they said was that the only survivors of the uchiha clan were sasuke and itachi according to what they found. like probably dead bodies. if they didn't find a body, they probably assumed that that person was dead. speaking of that though, how did they know that it was itachi that killed everyone in the clan? they knew it before sasuke revived to be able to tell them. if someone else from another clan saw him killin everyone, he'd then probably kill them too. but back to this, maybe itachi was like friends with that person or something and didn't or maybe couldn't kill him (maybe her?). or that person might of ran off or was somewhere else at that time. but i still think that they were exiled before that time. but if he/her was, wouldn't they still count him/her as kinda part of the clan? jw