Board Thread:Theories and Speculation/@comment-45382951-20200609150217/@comment-6769189-20200610210735

FlatZone wrote:

It's likely both. Sasuke had basically mastereed the Curse Mark in the past so that would make sense that he could sense Natural Energy Curse mark functioned a little more like Bijuu cloaks more than actual Sage Mode. It replaced the users chakra with Orochimaru's Senjutsu chakra rather than the user taking in and balancing Natural energy