Board Thread:Theories and Speculation/@comment-45382951-20200609150217/@comment-9782468-20200610173818

I will make a distinction; didn't Kurama gather a lot of Nature Energy, but also converted it to Sage chakra to send to Naruto? Could it possibly be the reason that Sasuke noticed, because it was chakra and not Nature Energy?

Though @Elve's explanation of Sasuke being able to sense Nature Energy being gathered due to his experience with the Curse Mark makes sense as well