What*, didn't*, are*, are*. And no. You're being blind to the ability of the card that beat up Nightmares and Piranas.. What if the SoB clans were taken down by an 8 powered Soa ability? Wouldn't that give the same result as it's down to base stats, and the cards who were beaten were all 7 base power or less. Not that game logic is in any way applied in comics, but still.
My entire "thought" of this is that they're possibly adding "nega-clans", starting with all-stars first (the idea being that there would be an "opposite" of each clan, with their bonus being the stop version of said clan). The "masked warrior" is probably nega-El Gringo.
I dunno what this really implies but my guess is that there's gonna be a Luchador clan.