this game is dying and there is nothing you can do about it. Right now the only active players are just trophy hunters. There is no actual challenge or fair competition in none of the servers.
It is always like this: 1 super big kingdom with 10 sub-branch, 2 to 3 medium-sized kingdoms everyone knows has no chance of winning.
The game is corrupted already and this new rule just promotes the use of wing kingdoms, letting their king join the main one at the end. We see the multi-kingdoms do not use union because they lose the achievement at the end. Pathetic they just go on till near the end with a single king and 2 dukes