Many examples like this. https://www.warzone.com/Clans/War?ID=29&Timeslot=4511
One way to improve it, would be to randomize matchmaking, versus the existing top-down system. The first way is to randomly choose a clan from the stat list, then randomly choose a member. then, the second randomization is to match with either next higher, or next lower rated player, based on coin flip.
That way it's a distribution of the last odd man out, if there is one. Although clans that flood the template with 50% might not get all their games, so clans with that play style might object to this method based on that. Every pro has it's con you see...
TLDR: Randomize matchmaking by 1. In each template, for each slot, randomly pick a clan, and a member from that clan. 2. Match with next higher/lower rated CWR based on coin flip. 3. Profit.