Lyonesse was actually very adamant about refusing spoils of war. The king declined offers of land and even disparaged a noble for looting Hereot lands, saying that he might have to reimburse Hereot for any gold that was stolen. The fact that Fiddleford was conquered by Lyonesse was purely a fluke.
The reason for Lyonesse' participation was that Hereot's king announced that he was going to raid surrounding lands, which the king of Lyonesse interpreted as a threat.
That's why I said I might be wrong on them. I vaguely remembered their refusal, but couldn't recall why they did fight in the end.
As for Eston and BoM still being there, they're both shells of their former selves. BoM itself is dead inside and Eston is tiny and needy.
