why do people argue this? kyubi said himself that "if naruto dies, then i die as well"
who would know better than kyubi himself??

and jiraiya said when he saw the seal that the 4th did it to protect naruto. Sure he was referring to the seal itself, but think about it.....if the 4th was naruto's dad...and he's the only remaining family naruto has (since naruto was alone after the incident)....then why not give him the power of the kyubi to watch over him if the 4th wont be there?

I think it makes perfect sense that he would do such a thing to help out his orphaned son