Board Thread:Theories and Speculation/@comment-45382951-20200609150217/@comment-24824859-20200611165137

Ninja Of War wrote: I don't think that it was clear that Sasuke could sense natural energy. If Sasuke could sense Naruto's chakra through dimensions after Hagoromo power-up, then it stands to reason that Sasuke could sense sage chakra build-up. And therefore infer a large amount of NE by deductive reasoning. Sasuke can only sense Naruto's chakra due to the connection they share from Hagoromo. He couldn't sense Obito, Madara, and Sakura while they were in the Kamui dimension. So, therefore Sasuke can only sense Naruto's chakra. It might be because of this connection, that Sasuke was able to sense Naruto building up sage chakra/natural energy.

So far, these are the theories as to why Sasuke was able to sense Naruto gathering natural energy
 * The sheer magnitude of the natural energy gathered
 * Likely


 * Experience with the Curse Mark
 * Highly unlikely since Sasuke had no clue that Kabuto was entering Sage Mode and Juugo (the "original") is confirmed to be a non-sensor


 * Naruto was actually gathering sage chakra, not natural energy
 * Very likely, since what Kurama did is the "instant Sage Mode trick", which is the instant transfer of sage chakra via clone dispersal. It's also confirmed that non-sages can sense sage chakra as seen when Tobirama and base Minato sensed Juubito's and TTJ-Madara's sage chakra respectively.


 * The connection they share from Hagoromo
 * Highly likely, since Sasuke is confirmed to be a non-sensor but, because of this connection, he could sense Naruto across dimensions. If he could do that, then it stands to reason that he could sense Naruto's chakra in general