Board Thread:Theories and Speculation/@comment-1512913-20150221101637/@comment-25113423-20150301034954

Oh lawd. I have a few comments, so I suppose I'll start with Elve's points...

Sasuke's Rinnegan — like someone already commented, of course Sasuke's Rinnegan has the power of two Rinnegan and an EMS. He popped nine Chibaku Tensei at once (without even needing orbs!). And I believe someone made a point of how the Rinne in Rinne Sharingan was the part that powered the Tsukuyomi into Infinite; well, Sasuke's Rinnegan parallels that same mechanic in that the Sharingan-based genjutsu hypnotized the nine beasts at once.

My theory on it:

I think it is a chibi version of the Rinne Sharingan (just like his Amenotejikara is like a chibi version of Kaguya's Amenominaka, even in naming). It could have happened due to influence of the nine beasts' chakra over the chakra Hagoromo gave him. They were in that afterlife chakra plane thing, weren't they? But they weren't merged into the Ten-Tails, so he didn't get the real deal.

I also think it may have something to do with the MS's Transcription ability... I put the Kanji for that jutsu in romajidesu(dot)com and it said that the "transcription" refers to genetic transcription. Maybe some transcription occurred between Sasuke's EMS and Rinnegan genes. On to the next point...

Kaguya not having Rinnegan — I think that's irrelevant. She was the original owner of the Rinne Sharingan. Those genes were spliced in her legacy. Let's see... Madara got all his information from the tablet, which Black Zetsu manipulated. And Black Zetsu apparently knew everything about the Transmigrants (even how their genes/chakra worked). It's possible that having both Rinnegan was simply a condition for the genetically distinct wielder of the Rinnegan (aside from of course having Ten-Tails'/Kaguya's chakra) to get the Rinne Sharingan.

And my two cents on Susanoo...

It wasn't just Madara. Itachi and Sasuke had Susanoo active without MS when they fought Kabuto (they did have regular Sharingan though)... Or at least Sasuke did, I don't remember if Itachi did as well.

And none of Susanoo's abilities have anything to do with eyesight. My theory is that Susanoo is the culmination of the user's Curse of Hatred, or at least the development of their intensely emotional chakra. As Tobirama remarked, the Sharingan initiated with a sprouting of "special chakra" in the brain following a loss of love. Karin had noted how "cold" Sasuke's chakra had gotten around the time his Susanoo began to bloom (the Kage Summit).

You probably need MS/EMS to develop your Susanoo (because of the whole Curse of Hatred deal) but activating it is a different story.