Like I said, timeline wise that makes no sense. They would have to make a new timeline for that to work. The Archon Priest is a Fallen Priest that escaped from the Prison of Elders, probably a Wolf Priest. Well, that got lifted out. Remember, HoW happens after the Wolves have their uprising against the Queen. And we're just hunting down stragglers. The Archon Priest might be during when the Wolves started breaking themselves and others free. And they sent the Archon Priest to the House Winter for safety. Which ultimately means that, time wise, this is happening either through out or slightly after The Dark Below comes around. I am guessing, since we don't have dates to accurately confirm when something actually happens. Which might be a reason why House Winter joined House Wolves so quickly? Hmm.... Point being, there is no way that Oryx could have even arrived in our Solar System before we got the Archon Priest and dissipated his body in a flurry of Ghorn rockets.