If he was dead in the throneworld, there would be no resurrection possibility. As i said to the person above, i think that the walls of the dreadnaught are the limits of the throne-world, and we fought him out in space with Saturn as the backdrop, that may not count as "in" the throne-world but out the backdoor. i believe that now we trapped him in his throne-world (inside the dreadnaught) and the heroic raid extends into the throne-world. The reason i think all this is because if Oryx could be revived from anywhere, I think that Crota would be back at some point by having an act of lost hope happen, either by Oryx, or Oryx's sisters. And until that happens, I'm inclined to believe otherwise. Also it would mean that Oryx would have little reason to come to our system in the first place. If Crota could come back, then Oryx wouldn't be too inclined to finish what Crota started. Just pluck Crota out of oblivion and put him back. So if Crota is done for, then if Oryx was killed in the throne-world then there is no bringing him back, otherwise we didn't kill him in the throne-world, and we more or less banished him there for now.