It appeared to me that kakashi did open a gate durring the rock climb. Also I think that the 4th hokage is Narutos father because if you are going to seal some deamon in a child whos would you choose, your own child or someones from the village. In my mind I could never do something to someone else, if I would be willing to do it myself. That would also explain why the 4th and Naruto look alike.

Also I wonder how does Naruto get money? Maybe his frog creates money because it look funny when it is stuffed full.

Well thats enough of my crack crazed ideas.