They weren't but the people who were invited chose them as their partners (you can pick your partner).
I'm watching. My only thing is from watching Ninja's Vegas event earlier this year. Overly aggressive players like HD, Ninja, and Daequan usually don't do well in tournaments like these. What happens you push a fight then someone else in the cut waits for you to finish. Then they come out the cut and kill you while you have no mats and depleted health. However since this is duos it might be a bit different.