Actually, Orochi is dead, but part of his consciousness is preserved through the curse seal. It can also be said that the curse seal is his consciousness, but in that state, Orochi can't do anything. , because it is just consciousness and cannot control the subject. Later, Sasuke passed the curse seal on Anko (why Anko? Probably the most complete and pure curse seal on her body, after all, it was set by Orochimaru himself), Use the reverse evil spell (the evil spell can eliminate the curse mark, and if it is reversed, it can probably make the curse mark grow) to liberate Orochimaru from the curse mark, but the Orochimaru is quite weak at this time. In other words, Orochi has been hiding in all the curse seals he had personally placed before.

And he is looking for Orochi to use the scroll through Orochi. This should be certain, but the function of the scroll may be about the secret of the curse seal. This is my guess, because Sasuke has obtained the best blood wheel eye ( Although the strongest blood wheel eye is the reincarnation eye, it requires the chakra of the Senju clan) If you want to get closer to strength, you can only strengthen the curse seal.