Maybe that's how he found out the truth behind Rin's death because he ended up controlling it's next jinchuriki - the fourth mizukage.so rin was the sanbi's jinchuuriki. But, in the past, we all know that obito was controlling the 3rd mizukage, so didnt he have access to all the info on Sanbi? And, dafuq was that? Somebody killing a jinchuuriki and yet avoiding an uproar !?? Even the shukaku would have Kakashi dead by now if it was him!! If you get what i mean..
4/5