Alright guys, here is the deal. We already have seen just how far kurama can be split up. Kinkaku and genkaku had a piece, and minato has the yin half. It is not sacrosanct by a long shot. Naruto has a decent piece, and because bijuu can recover their own chakra, it's pretty much his forever, but there is another piece... Minato is missing an arm. He can still perform rasengan and throw kunai, but something tells me he isn't the kind to outlive this whole process. And while he said that he had a "gift" for naruto, what happens if the yin half is the gift, and moreover, what happens if sasuke NEEDS it. Well then we might have a dual fox standoff. Sasuke also stands to have either more control or even a better relationship with kyuubi with his sharingan. Yes it can outright control, but it can do SO much more. Sharing memories, emparting emotions on images, directly influencing feelings. And if he masters tsukuyomi within bijuu space, then he could get some decent training time going on... While this may SEEM like it's the end of the manga to some, I highly doubt it, and if Rin'negan isn't sasuke's next power up, he is going to need it from somewhere. Kyuubi replacing the curse seal as his source of chakra?