They wanted the Caerwynians to join Aurvandiel in the great migration debate of 2011, didn't work out for them though, I think IC they would have a hard time justifying attacking their former allies in Madina.
Here's what I predict, using my powers of perception and a magic crystal ball.
Most of the Saxons from Caerwyn join Barca or Terran, if Aurvandiel loses they push for allowing Aurvandiel nobles into Barca. Get into Barca, take over!
Ta da!