Re: Naruto Manga Chapter 603 Discussion and 604 Predictions
The 3rd white Zetsu and another are attacking Kakashi and Rin, but don't necessarily expect to harm them -- just absorb their chakra. Kakashi and Rin are long gone before Obito gets to where the battle occured. By this time, Zetsu is impersonating Kakashi and Rin and causing the Rin-Zetsu to die while the Kakashi-Zetsu runs away angering Obito starting him down his current path. Zetsu was really milking Obito for information during the training so he could be manipulated. We will later find out that the real Rin is still alive, but Kakashi has kept her in hiding or changed her identity after the Zetsu attack in order to keep his promise to Obito.
Similar to what some other people are saying, Obito's Zetsu suit manipulates him and affects his mind driving him further down the evil path. Meanwhile, Rin has dropped off the grid and even Kakashi doesn't know where she is. All the while, special high-level sage training has allowed her to have the ability to know things, kind of like Naruto's sage mode, but more focused. The scroll that Suigetsu found revealed her existence and that Orochimaru was involved in hiding and training her, which is why Sasuke needed to revive him to find "the one who knows everything".
After meeting up with Sasuke they all show up on the battlefield. Rin's sudden presence confuses and distracts Obito who is then mortally wounded by Kakashi (who is also gravely injured). The combination of Naruto's TnJ and the truth of Rin's survival cause Obito to pull a Darth Vader on Madara before he dies. Madara retaliates, but Rin tries to defend Obito. Team Minato is reunited as they die together on the battlefield. However, Madara is severely weakened allowing Naruto and the Konoha 11 to overcome him in an epic battle before he regenerates.
Sasuke, because he's Sasuke, decides he still wants revenge for some obscure reason and assumes control of the Gedou Mazou statue during the confusion of the battle and uses it to occupy the allied shinobi force. Sasuke wages a devastating 1-on-1 battle with Naruto who uses his recently upgraded TnJ on Sasuke followed by intense flashback action. The fight ends with a typical Naruto-biju-dama / Sasuke-susano'o-infused-chidori clash.
... kind of a longshot, but Rin being alive would be a pretty unexpected twist.