HOLY S**T Batman!!! That's what I was looking for. I've always had a Nagging feeling that we were going to see the previous four Hokages one day. I rate this chapter a 5/5 for pure bad ass'izm
Remember that Kyuubi is a chakra beast. I'm wondering if the yin portion of Kurama will seek out Naruto automatically (similar to the way Oro's arms returned to him the min his chakra was free from the death gods stomach.) However there could always be a chance the yin side will reform itself right in the middle of Konoha. Then it'll look like a repeat of the first attack. But with it free, can Madara sense it and summon the fox? Think how epic that fight could be. Naruto fighting against a brainwashed Kyuubi.... But wait, there's more. What if the 4th turned himself into a Jinchuriki before his death. (Similar to how Kurama was sealed inside Naruto.) Now that he has been summoned by EDO, perhaps he'll still be a jinchuriki and we will see him fight as one. Let me know your thoughts about this