I always found it sad that Kakashi related to Sasuke during the early team 7 days. They'd both lost basically everybody in their lives and had the cool, quiet attitude. I mean remember had that talk with Sasuke when he was tied against the tree?
Kakashi specifically chose to train Sasuke for the Chunnin exams and taught him his best move. Kakashi probably saw his young self in Sasuke- which sadly turned out to not be the case. He never had the killer spark inside of him that set them apart.
Surprisingly, Naruto ended up as the Will of Fire carrier. He would go on to surpass Kakashi through his own training (rasenshuriken) Not only this but they both failed to keep their life-long promise to an important person in their life. Kakashi failed to keep Rin safe and Naruto failed to bring back Sasuke. They actually share more in common than you'd think.
What do you think? I kinda like how Kakashi is his own character and not just a carbon copy of someone else like many other Naruto characters are. He's almost like a mix between Naruto AND Sasuke. And a little bit of Sai.