Hmm I took it as if he meant that he left everyone what was precious to them, he was refering to there home, by giving his life to protect their home and families. and that maybe Kakashi didn't think that Naruto would completely understand that because he was to young. But when you get older you realize what is most precious to people... you home and the ones you love. So that is why Naruto understood that a little bit. But if he meant something more than that we will find out later even though I just think that is what he meant. Bc if he didn't do that to Orchi, Orchi would of killed everyone... the sand nins themselves said they where suppose to kill everyone including women and children. Thanks to the 3rd he was able to keep what was precious as in home and family. I could be wrong but that is how I think of it.