I see people been wondering about why Sasuke can summon snakes. I think just this chapter is important:
Kabuto said "Orochimaru has died", then suddenly he changed his mind about it and Sasuke said "I took him over".
What really happened during Orochimaru's ritual, Sasuke reversed the jutsu for himself. He took over Orochimaru's body or mind, allowed him to access to Orochimaru's knowledge and jutsus.
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What really happened during Orochimaru's ritual, Sasuke reversed the jutsu for himself. He took over Orochimaru's body or mind, allowed him to access to Orochimaru's knowledge and jutsus.