Sasuke explained that he could use Tailed Beast Chakra earlier on from the Chibaku Tensei Naruto Manga 697 to release Infinite Tsukuyomi, hence why he doesn't need Naruto. You could say it's similar to when Sasuke was using Jugo's senjutsu chakra to add to his Susano'o. Sasuke has absorbed Tailed Beast Chakra via Chibaku Tensei into his Susano'o to empower it.
Sasuke's meditation - Lineart colored by DennisStelly on deviantART
Obito Uchiha & Kakashi Hatake - Sharingan Split - Naruto - impresión Digital de 11 x 17
When you're Itachi it doesn't matter who's there!
Jirya character info
Uchiha Sarada, Mitsuki and Uzumaki Boruto.
alm, cool, and even a bit apathetic, you easily shrug things off on the outside, while you forgive you do not forget. You only focus on what you deem important, and you are a VERY proud individual.