Board Thread:Theories and Speculation/@comment-1512913-20150827121154/@comment-5407586-20150830152530

I wonder… Obito and Kakashi could see through each other's Sharingan, right? What would've happened to, let's see, Madara and Izuna or Itachi and Sasuke had they exchanged eyes to obtain the Eternal Mangekyō? Could one see through his brother's eyes, since they were originally his?