From this chapter what i got that all the uchiha clan was killed by itachi obeying the elders order because they knew about it (saringan eye+ms+ems+hardwordk=rinnegan) i suspect that too ....but confused 
True, Rinnegan was special to Nagato but then Tobi had it and now Madara awakaned it, ruined the whole point of Nagato being in the storyI think it's sort of ruined the Rinnegan image making it easier to possess.
+repI think it's sort of ruined the Rinnegan image making it easier to possess.
i agree with this combo.I think it maybe Sharingan>MS>EMS>Cells of the first(Madara could have extracted during the battle with the 1st)=Rinnegan
yeah it kinda did to meI think it's sort of ruined the Rinnegan image making it easier to possess.