Board Thread:Theories and Speculation/@comment-1512913-20160709202754/@comment-26369387-20160709224143

Hmm... The thing is, Hagoromo had Six Paths Senjutsu before he became jinchūriki, so I would say it's more of Sasuke and Naruto having halves of Hagoromo's powers + Naruto having the Tailed Beasts.

As for Sasuke controlling the Tailed Beasts, I would say part of it is because Sasuke's Rinnegan has also abilities of Sharingan, which one of them is Genjutsu: Sharingan. If Sasuke had got regular Rinnegan(one without tomoe), I doubt he could have done the same with that Rinnegan.

That said, this is interesting theory.