Kabuto did too and that girl, can't remember her name, lying besides Kabuto right now. But Kabuto is the only one who has been effected this much by Orochimaru, I think it was Neji who said that 60% of his body has already been taken over. We will have to wait till next chapter probably to get all these questions answered.They all do have his Senjutsu Chakra, however, the Orochimaru in Sasuke was the major part of him as Sasuke did absorb him in his fight.