CoA has resolve. Are you surprised? Because I'm not particularly surprised by that.
OWR/Carthago left when Coalition B's plan was maintain the war and attrition our enemies into nonexistence* (I'm sure you meant to be more subtle "publically" but all the leaks prove deliberate intent)
Without getting too deep into paragraph three, because I don't want to speak for Sphinx. All I can say is "we started a war, but didn't want to end up with liabilities when it was concluded" is pretty fricking whimsical and one of those situations where thinking before jumping might have helped quite a lot.