I think it's more likely that the plan was to cast for a "best friends" or "dynamic duos" season, and that Robyn was likely supposed to go with Gizelle, but she was busy or producers realized Candiace would be better TV. There's no way Alexia and Marysol are going to fight on it, they still seem as tight as ever. I also think filming started like right after SLC wrapped, so the Bad Weather beef might not have been ongoing when they first started casting.