a lot of theories have included a power up to Sasuke by evolving his EMS to the rinnegan.
However, does sasuke even know of the rinnegan's existance?
Lets look at the facts:
Sasuke never encountered Nagato or any of his paths
Sasuke never saw Tobi post Konan fight and in turn with the rinnegan
the tablet that described to Madara how to gain the eye is not in Sasuke's possession
we have to assume Tobi did not tell Sasuke about the EMS evolution, in case he became too powerful to control
Sasuke has not seen Edo Madara

so how is it Sasuke will obtain a jutsu he doesnt even know exist?