Yeah, no. The Paradox thing was discovered a couple weeks ago. No Time To Explain was *not* available at the time Paradox's secret ending was discovered and completed. It did not appear till 2 weeks after the fact right after a patch in which likely added or otherwise activated it. For those of us that finished the Paradox secret when it was first discovered, the quest for No Time To Explain just magically appeared the other day in the same fashion as Sleeper Stimulant. And that's ignoring how it was timegated to specific days as DvzLionO pointed out. As for the others. We know there are still a number of exotic armours that are not obtainable yet and its not because they are secrets waiting to be discovered. Which is again, especially aggravating because Bungie never gave any indication they were not obtainable. Despite them sitting in the armory saying they drop in TTK activities and can be sold by Xur.