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You guys are missing some implied information in the chapter about Orochimaru.
1. Sasuke realized that Orochimaru was still alive and was "the one who knows everything" when he read the scroll with the plan to control the war/whole shinobi world. So Sasuke recognized something in the scroll that Suigetsu didn't, something that Orochimaru absolutely had no business knowing which implied he was still alive.
2. Sasuke is leaving the cave to find Orochimaru, even though practically every theoretical method of Orochimaru's true return is still in the cave. Kabuto and his snake? In the cave. Anko and her curse seal? In the cave. Sasuke himself? In the cave. If Kabuto found one of the snakes that escaped Itachi's Totsuka and Amaterasu and grafted it to himself, that snake is in the cave! If Sasuke wants to summon Itachi back with Edo Tensei in order to release Orochimaru from the bottle, he could force Kabuto to do it using Anko as sacrifice. EVERYTHING is in the cave!
So why is Sasuke leaving the cave? Not only does he know that Orochimaru is still alive, he also knows that Orochimaru is currently someone who is not in the cave. We just have to figure out who and where that someone - who "knows everything" about the clan and village - is.
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