Unless the Nexus is a nexus point of all times, places, and universes? So that when you jump around, you are actually getting a view into your life in an alternate universe. Now the fact Picard & Kirk exit the Nexus makes less sense to me.
Now I'm just confused, and the fact that Moore and Braga can't come up with a logical explanation either, is unhelpful. Did they take roofies before they wrote, blacked out, and now have no memory of what they were thinking?