for those who didn't know:Kakashi and Obito was together in the team and the sensei was Yondaime also known as 4th Hokage. If you was asking yourself why Kakashi have sharingan the answer is: Obito was from the Uchiha clan and during one mission he died for Kakashi and gave him his eye. Obito said to him:Kakashi I didn't give you anything at your Junin celebration...what would be good...I was thinking...and now I've come up with it...its not useless baggage..its this sharingan of mine..please accept it..I'm already going to die but I can become your eye and from now on I will see the future.The end...sad story right?