Kishi shows who kills Rin Obito is linked with zetsu and its who kills Rin Obito sees it before he get there but thinks he imagened it but its zetsus arm in Rins chest
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This is a very good point, no one else saw this ? Wouldn't this make it fairly obvious that it is indeed Madara's work ? I don't think Obito seeing a vision of Rin killed by a root is insignificant, if it was just to trick us into thinking Madara, it adds nothing to the plot. More likely his vision is significant, he could see it and this is all Madara's work. That's who really killed Rin, but somehow they show it to Obito as if Kakashi kills her.
Why do you think Zetsu is the one to warn Obito of Rin and Kakashi's endagerment in the first place, to be nice ? And it is probably Zetsu who has copied Kakashi's appearance, he can do that right ? I thought the entire scene could be an illusion, but with the root thing killing Rin, it would make sense that Kakashi is Zetsu. This is all Mada's plan, which is also why he's so sure of Obito's return. All this leaves Obito devoid of hope, makes sense, but I still don't see why he would be evil, as he's a good hearted guy like Naruto. Maybe he just doesn't care about the world anymore, and thinks he might as well help with Madara's plan, even if he doesn't believe it is for a good cause, he just doesn't care.
I think Obito is Madara's lost cause to use, his despair, like he used Nagato too, ninja's he knows he can use and twist their thoughts. He probably tells Obito so many things, until he believes them, so he takes revenge on the Mist, Kakashi, on everyone, that he thinks is to blame. Partly to his own thoughts but also Madara twisting them. So really, Obito going along with Madara's plan and "becoming evil", is simply his revenge on the world, he doesn't have anything to care for anymore, and he might as well get his revenge. That's probably why he does what he does now. I'm not sure why he said "you let Rin die", if maybe Madara tells him he himself did it, but Obito still blames Kakashi in the end, because he -let- her die, Rin is dead, he has no cause or hope, and his friend Kakashi didn't save her, neither did Minato. Who knows.