A 2v2 is a nice scrimmage, or something for bragging rights. taking 2 members of a clan does NOT show how good that clan is.
A 3v3 is as small as a match should ever be. Even with only 3 members of a clan, it still is not how well the clan works together.
A 4v4+ is what a proper match size should be. You NEED teamwork. You can assign positions, attackers, defenders, mid grounders. You can really work the strategy built into a map this way.
Taking my way back machine to when I lead Rust, we stopped accepting 2v2's after realizing this.
http://home1.stofanet.dk/berre/Rust/ <-- haha. that still exists?
But, matches need to be 4v4 or more to really push your clan as a team game.