a spontaneous gravity well
Spontaneous? That just sounds silly. Either it's there or it's not. I've never heard of gravity just sort of appearing out of nowhere. At least nowhere outside of movies. But sure, they could go off course due to an unexpected gravitational pull from a body they didn't expect to pass near. A slight change in course over a long trip will certainly put you very far off your destination. However, would a slight course correction place you in another solar system after a similar period of time? I kind of doubt it.
that was until they learn of Eden and Plymouth they decided before making contact they sat and watched
So, the last survivors of earth, by some miracle, ran into the only other survivors of earth, and they didn't make contact. After months of isolation in space, and being the social creatures that we are (yes, even the loners), we would probably be going a bit funny in the head and would stumble head over feet to greet anyone else we ran into. Ever seen how talkative people from highly isolated areas tend to be?
I think if Eden and Plymouth are somehow involved in the storyline, then everyone must somehow come from they same ship they all arrived on, like say another splinter colony. Particularly if they meet up at some non previously agreed upon destination.
At least that's sort of what I would think to really accept any new story.
Sirbomber, not the nicest reply. Although, those links were kind of interesting.
I also think wormholes seem a bit too fictional for the Outpost series. They seem to be more of a theoretical construct, that may work on paper, but not something likely to be encountered, or usable if encountered.