Given the fact that there would be 12 flags in the Wo3K, I suggest that matchmaking should be based more on the overall depth of an individual player than the current system of more weight on the strongest five heroes.
I have an alliance member who fields a defense of 4600 TP, but he can’t even score more than 100 in alliance war, because those 5 heroes are the ONLY five heroes he leveled. Frustrating to have such teammates, I would think it is, for most.