In my game Neptune's Pride there is a person using 2 accounts. It is obvious because of the names of the players and the coordination of their attacks but also because of their stats. You can see how he always lets one of his accounts win. The two accounts are Grum Destroyer of Worlds and Jon Destroyer of Worlds. Please kick both accounts for he has appeared to have done this in 2 other games.
I don’t see any definitive sign of cheating. It’s quite possible they are friends who joined the game together. The similar names makes me think they are more likely not cheating.
Since they are clearly working together I would advise creating an alliance to take them down.