Curiously, members of this species have been observed in the Deep Space 9 station at the other side of the galaxy. It is hence possible that the Caatati civilization extends or has previously extended into the Gamma Quadrant and has access to the wormhole leading to the station. Another possibility is that these represent outcasts who have explored the galaxy on their own. In any case, save for the possibility of these beings belonging to a different species which happens to look identical to the Caatati (the same way that many unrelated Star Trek species look externally identical to Humans) it is likely that the 27 nomad ships encountered by Voyager are not really the last ones of the species, even if they may believe themselves to be.