Kakashi, in the first couple of days of training the new genin, was always shocked at how much they were alike.
Naruto, the loud and troublesome one who always believed in putting other people above the rules, and wouldn't hesitate to shove his opinion in your face, he was Obito.
Sakura, the one who could easily be a medic nin, with excellent chakra control who could always teach people anything they wanted to know, she was Rin.
And Sasuke, the child prodigy, belonging to the near extinct clan of the Uchihas, Kakashi could see more than enough of himself reflected in those cold, dark eyes.
But when he walks into the Valley Of The End and sees Naruto lying there, unconscious or maybe even dead, he hopes that maybe he was wrong, and there was a difference between him and Sasuke.
But he knows in the end, there probably wasn't.