The point being made here is BB really has no chance to win the war or a crown past a certain point. There was a point where they held the NW gap and acres loss (them being down 20k constant) but after that their NW crashed and became down 37k acres, that's a clear of a loss as possible. The only reason to not withdraw after such a loss is to influence the crown race. I'm not saying Bb and 6:15 were in collusion. I'm saying when it became clear that BB had 0% chance to win, their only reason for not WD was to be spiteful and influence crown race.
The funny thing though is when this gets used against Bb in the future, they are going to whine and make angry forum posts or maybe even organize a GB (nesta is good at that, it's about the only thing he knows how to do other than begging people for land drops OOW). Generally it's stupid to piss off a kingdom that is superior to you as that makes life harder and there isn't a single person who plays this game who wouldn't pretend otherwise.