Board Thread:Naruto Discussions/@comment-3279282-20140421103228/@comment-945885-20140421160358

Sasuke wasn't given Six Paths Senjutsu, Naruto was. Sasuke got the Rinnegan.

As I understood it, Six Paths Senjutsu is characterized by the one rinne, nine tomoe emblem that appeared on the backs of Obito, Madara, and Naruto, as well as the manifestation of Truthseeker Orbs (which actually function more like tools, as they can't be turned on/off or regenerated, according to Minato's earlier explanation).

At this point, I don't think there's any way to really know why Sasuke's Rinnegan has tomoe and why Hagoromo's and Madara's don't. If I had to guess, I'd say it's a result of Sasuke having Indra + Hagoromo chakra, rather than just Indra + Asura. Because Hagoromo is the progenitor of both Indra and Asura, it only gave them a fraction of their opposite's chakra, but also supercharged their counterpart's existing chakra, so to speak.

In other words...

Hagoromo = 50% Yin + 50% Yang Indra = 100% Yin Asura = 100% Yang Madara (Indra + Asura) = 100% Yin + 100% Yang Sasuke (Indra + Hagoromo) = 150% Yin + 50% Yang Naruto (Asura + Hagoromo) = 50% Yin + 150% Yang

So Sasuke gets just a single Rinnegan due to receiving half the Yang, but that one Rinnegan is supercharged by the extra Yin.

Just a theory, of course!