When The Clan war Ends, it gives rewards to the clan evenly. Does it give the rewards to the current clan members, All Ex-clan members, All members who participate or other? If it is Current members, Managers can just kick members so they can get more rewards.
So, if a clan had 40 participants, and one player swept all their games and managed to single-handedly win the season for their clan, that player alone would get the 2000 coins, rare art, all idle powers, and the territory rewards their clan qualifies for. However, if 4 of them won some of their clan's games, those 4 would split the 2000 coins, 500 each, each get a rare art, each get all idle powers, and each get the territory rewards their clan qualifies for.