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I completely agree with Adelaide! Firstly, clan wars are a team game. After all, when, for example, a football team wins or loses, it doesn't matter who played in that particular match. The team as a whole wins or loses. The same applies to clan wars – they show the strength of a particular clan as a whole. Secondly, if you try to coordinate 4 specific players at a specific time, there will be difficulties (I am sure of it). In a seasonal tournament, one pair may not be able to find time within a week to play a match. It will be even more difficult for four players, so the interchangeability of each pair, in my opinion, should be possible.