If they are replacing Cena it has to be a Raw brand person, since for whatever reason they counted Cena as part of RAW. Smackdown already has their 4 with Orton, Hardy, Rey, and Miz. So Almas, Sheamus, and Cesaro are probably not going to work. But Elias certainly might. Given this tournament sort of doesn't matter anyways, I suppose it doesn't matter who they pick.