As Arbiter of the Kaggath - I shall decide which alliances are viable and which are not, to avoid such 'what if' situations. You'll put forward the arguments though. And ultimately their can only be one winner so strength of armies and plans is an inevitable factor.
All that will happen is the debates will degrade into "what if" situations.
We will no longer be comparing the strengths of the armies and their plans, but which leader would do what under these circumstances that happen because the other guy was in an alliance with the first guy because for whatever reason he though that would be a good idea because the other two might have formed an alliance, so that one had to make it before the other one did and he managed to do that because he's better than the other.
And yes. It'll be that confusing.