I think AL is Naruto's mom.
Sorry for just dropping the bomb like that and leaving... Although I don't have any hard evidence, I can suggest ideas, right?
(Let's say for the sake of argument that the Fourth is really Naruto's dad.)
1.) They never throughly explain how the nine tails was sealed inside Naruto. I can only assume (maybe) that the same thing was done done to Naruto's mother as done to Gaara's mother. But the difference there being that she might've survived. Like I said, odd assumption.
2.) AL, possibly being Naruto's mom, want's the nine-tail because it's the Fourth's legacy, therefore she will always be with the fourth. Love reunited. Again, odd assumption.
For right now, that's all I can think of. I had a lot more in mind, but I must've lost it since last night.