If you know the history of "the dead man's hand" there is a down card in addition to the aces and eights. That card is the queen of hearts. They've shown the down card (facing down) with the aces & 8's on TV several times. Who better than the Queen of the Mountain, Karen Jarrett, to be the leader of the group for the reasons outlined by
GrandSword:
We all know the Jarretts will be back sooner or later, what better way to bring them back than to have them invade BFG in revenge for Jeff not being chosen for the Hall of Fame?
As for Joseph Park, of Park, Park & Park, he is probably the one letting Aces & 8's into the Impact Zone. The big guy in the group is not Abyss, but the third Park. BTW, I see the show live at the Impact Zone and the big guy is not being played by Park, however I think Abyss is doing the voice over for the character.