This wouldn't work. Enemy clan may not be ready.
The big outstanding issue is to be able to select those in/out of War. Leaders need to have that ability.
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Def need to confirm participation in a war. Either elders/leaders select active members or better yet each member has to confirm their participation prior to finding a war match, then matchmaking would be based on total number of active players. This has been a big problem for me and my clan because we have 50 members and its just not possible to have all 50 active for each war.