I joined a game recently where I noticed that before it started a few of the same users were leaving and rejoining constantly. I've only ever really seen this when I do private matches with friends where we try to get bases near each other to team up on others.
As the game progressed it became obvious that these players were working together as they hardly attacked each other. They also had lots of extremely well coordinated attacks. The type of coordination you don't see from strangers.
Am I right to think that something strange is going on with these players and that they could be friends (or the same person) that join together? Or is this a common thing? It's just extra odd that it was the same couple of players who were alternating joining/leaving.