Board Thread:Versus Debates/@comment-31338621-20200309130706/@comment-43403813-20200313182838

Given that Obito has a Sharingan, he'd see the chakra networks of Itachi and his clones through the LOS Blockers. Even if Sharingan can't tell the difference between clones and the real deal, all Obito needs to do is to pay attention to see if Itachi swaps places with ones that he has just summoned.