I wish you could get it though your head that the possible joint victory was more of coutesy from Arch than anything else. I had assumed that after the war Arch would come out clearly domenent, and further fighting would be pointless. However, if this is not the case, and the other players are interested in trying to take down Arch at that point, I would be happy to break the alliance stay on board. And, as I said before, whatever happens after your empire is gone is irelevent to whether you are quitting.