So it is a Sasuke-Oro hybrid. It's just that Sasuke's in control. So Sasuke's like Two-Face. I wonder how long until Oro starts coming back.
What's weird is in the first page Sasuke doesn't have lines connecting his swirls, it's just his iris, then he does have a clearly drawn line. Maybe the beginning stages of Mangekyo, but I doubt it's the full "MS."
So Sasuke wasn't strong enough afterall to kill Orochimaru. He wasn't even as strong as Itachi to keep Oro out of his head.