They started that when they were about your age.

[Gai had been able to reach Kakashi in a way the rest of them really hadn't been able to- it was almost reassuring to know it still happened.]

Kakashi has faced a lot of... difficult situations, many when he was still young. [CAN'T TALK ABOUT PEOPLE'S PASTS BUT. PLOT.] He changed even in the time I knew him, I don't doubt the Kakashi you know is much different to the one Obito and I knew.