Do you think according to the latest chapter that minato will save obito because he doesnt know he is evil or because madara is gonna use the renni tensei??
Doubtful. Don't forget Minato is like Naruto so he could sense Obito's malice the moment he went into Kyuubi Chakra Mode or whatever it's called. I don't think he would save him even if he could especially when he learns that it was Obito that was behind the Kyuubi attack on Kanoha.
I don't think so. U_U I mean, if he doesn't know Obito's 'evil' surely someone would point that out sooner or later - or at least before he would attempt to save him? I don't know, I just don't see it happening.