Well I have so far read many threads stating that madara used some kind of advance rinnegan technique to do so, a technique that even nagato wasn't aware.....but I beg to differ......what I believe that it wasn't a advance technique of rinnegan in fact it was 2 different technique of rinnegan...
Well obito never thought sasuke as a comrade,he doesn't care if anybody is with him or not
orochimaru trained sasuke not because he thought sasuke as his student but wanted to kill him and take over his body.....and orochimaru refers to him as his student sounds weird to me.......it doesnt...