Hey, I would like to suggest a war disadvantage or something of the sort for groups. In some servers their are groups that will always win the Great Ninja war because either they are well above the power of other groups (ex. Group 1 power: 900,000, Group 2 power: 500,000) The power difference in the top group(s) easily shows which group will always win in the war so, I think that it should be a system to the wars that will leave the group that win 3 wars in a row at a slight disadvantage or give the other groups an advantage that'll give them a chance to atleast win wars or battles against the #1 group.
Thank you.