Sven, how does the idea of necessary people according to tier sounds ?
Top 13 guilds- 45 people are needed in order to participate in War
Top 26- 40
And so on.. lowering the minimum of each tier by 5, so that the top of the notch guilds are always required to fully use their guilds, while still having more than enough spots for people who need to be opted out / couldn't recruit properly or fast enough after losing members
And this "filtering" can happen during the registration period that's 1 hour at the end of War
If by some reason, a guild loses members and falls below the quota during the War week, the guild that ended that week, for example, #14, swaps places with the guild among the top 13 that has lost members. Afterwards, the guild that fell outta top 13, can have some crown advantage in order to get back faster.