Quote Originally Posted by DarthEnder View Post
It doesn't make a whole lot of sense, but that seems to be the case.

I understand that purifying Sasuke of Orochimaru would, say, removed the cursed seal. Since the seal is a part of Orochimaru.

But causing him to just...forget all of Oro's techniques. That doesn't make a whole lot of sense. I mean, what does being able to Summon Snakes have to do with being controlled by Oro?
It's got nothing to do about being controlled bu Oro, bit Oro being present. When Oro and Sasuke combined, the body contained everything from both of them - the fight was over the control of that body. It makes sense that if one half got expelled that the other also loses the perks.

As for snake summoning, the contract was with Oro, not Sasuke. Of course it would go when Oro "died".