Nah you are not wrong but not right too.
The users they play always together as team are mostly secoundaccounts.
They have other accounts to play alone against other player.
This Teamplayeraccounts are mostly for the funfact, that they play always together.
The real problem about other badaccounts is, like you discoverd, that they dont find fast new enemies for their mainaccountgames.
So they create new accounts and win against unprepared users.
Now the new accounts have a high skill again and they create new accounts.
Some user think it is funny to have 2-3 accounts in the tophighscore. So they create more and more.
To stop this we discus about
match making.