Well in Fam they are still doing back and forths so I think since Prester's weather controller was fixed when Exile activated in the first series it was still inhabitable enough where they could have a sort of second place to thrive on (which makes sense considering Fam's environmental state).

But yeah the Apis and Cocci thing was. They kind of went against what they had them be like in the series/explained in the Chronicles book itself so that is just. :|a Lol?