Clan war proposal

How tired are we, when we start a clan war and one or two members leave during prep day? These folks take the place of members that wanted to war, but due to hiring issues, or numbers, they couldn't?

I'm suggesting that we could have subs, like a proper team has, one member leaves, another takes their place! It's not an unheard of thing...

Too exploitable. You have your top three players tank their trophies, so they are in the bottom, not in war. For 23 hours the opposing team sees smaller players, then three tiny players drop, an the giants come in. Not exactly an ideal circumstance.