It says you need at least two people to play in clan wars but they don't recognize without a min clan of three.. so I would say to get in the clan wars you need 3 people in your clan but for stats from a game to count it sounds like you need at least two people playing in a game for it to count.. (at least this is what I'm seeing on my end so far, could be different for others)
Here is whats happeneing ..
Lets take Dom as an example..
Your clan wins the 50 games required to secure the spot. It then freezes the rest of the clans wins. The rest of the clans in your group wins games trying to deplete your 50 win count back to 0 to unfreeze that spot. Now all clans wins are unfrozen and first to 50 retakes the spot..
There is a place for this.
And here is some info on how all this works.