Why can't I enter the Weekly heroic / Nightfall then? Do you have to do all the missions apart from the Xur one or?
Yes, all of them except xur, which in turn unlocks that particular strike. Meaning the nightfall and weekly is then unlocked. You can do it if under lvl 30, Maybe 27? You could do the original nightfalls when 25 anyway so it's probably no different here for lvls. But you do need to do all the new missions except for the xur one.
