Board Thread:Theories and Speculation/@comment-45382951-20200609150217/@comment-24824859-20200609160328

Sasuke was able to sense Naruto absorbing natural energy because Kurama accumulated a lot. None of Sasuke's jutsus used against TTJ-Madara and Kaguya were confirmed to be senjutsu. It's quite possible that the reason why Sasuke's jutsus were effective is because they contained Six Paths Chakra.