[ Ah, right. Sakura doesn't know the truth. Kakashi's gaze travels from his students to his sensei. It would be up to him as to whether or not Sakura is informed about the massacre, though Kakashi does think she has a right to at this point. After all, Sasuke's actions were guided by an atrocity carried out under the guise of protecting Konoha. ]

Yondaime, I don't believe Sakura knows the details about the Uchiha Massacre.

[ He doesn't specifically ask Minato for permission to explain, because if Minato wants Sakura to know, he will fill her in himself, or so Kakashi figures. ]