Board Thread:Boruto Discussions/@comment-33545035-20191020164526/@comment-43403813-20191027133750

@Prince That doesn't mean that Naruto wouldn't be able to sense Jigen, which was the point I was trying to drive home. The chakra a microscopic bug possesses, and the chakra an Otsutsuki possesses would surely make a massive difference in whether they are detectable or not, given that Naruto can detect chakra presence.

I don't think Obito knew of Torune's nano-sized bugs beforehand, since they would most likely have concealed their abilities as ANBU in order to work efficiently and with the element of surprise. Fuu also said that because Obito had deduced his own mind-transfer ability, they should utilise Torune's, because Obito hasn't for Torune's technique. Also, when Torune showed off his tech at the start of the battle, Obito simply said "that technique..." which could mean anything, it could be him recognising it, or him being simply curious about a technique he isn't familiar with. Point being, Obito would have had reason to look at the technique to that scale in order to deduce it in that moment, with his Sharingan.

But yeah, fair enough Sasuke might lose track of Jigen occasionally, but I was just wondering whether Sasuke could even see him shrunk in the first place.