I don't think the Siudeks really knocked anyone out. Sure, NN/L would have gotten silver, but they weren't eligible for a second event anyway. Cody/Hay's next event is CoR, where they are unlikely to medal in a field with the Pettikhs, Sav/Szol, the Siudeks, and WakaFeau, so a bronze at SA and a 4th or 5th at CoR wouldn't have moved them into the GPF anyway.
Marcoux/Buntin have just as good a chance for silver at SC as I/B, maybe better, since I/B are injured. The only other team at SC who might get shifted out is Volosozhar/Morozov, and they still have a shot to beat I/B. Where V/M get shafted is at TEB, where they have to contend with 3rd-spot Zhangs, I/B and the Pettikhs, as well as Obertas/Slavnov.
In fact, I see TEB as the really tough spot because there are three seeds (I/B, Pettikhs and Z/Z). Obertas/Slavnov get zapped as well as V/M. In fact, I/B could lose out on the GPF, too, if they haven't recovered from their injuries. They pretty much have to medal to seal the deal. If they finish 4th they might or might not get in.