I don't think they're the others, I think they're just the tail end people. And they're really bastardly, and eventually both groups will come together. I just hope JJ Abrams is smart and cuts this off after a few seasons and resolves it well, it could be amazingly great.
I really like how Rodriguez was used in the season finale, talking to Jack at the airport bar. When she says she's in the back of the plane, it's pretty emotional because you know she's going to die. Now they've reversed that and brought her back, and she can punch the fuck out of Sawyer.