Carla said she screwed up a sauce in the interview. I don't know what sauce she screwed up, but SHE said she screwed it up and never recovered. She also said she let her nerves get to her. Her biggest complaint was they had too much to do, in too little time. She couldn't recover from that. Fabio and Stephan could. I will say that Stephan and Fabio had better Sous Chefs, but Carla would have chosen Casey anyway.
I have no real opinion about Casey, didn't watch her season. After my choice left the competition I did want Carla to win.
Anyone can listen to the Talk of the Nation interview. It is up at NPR : National Public Radio : News & Analysis, World, US, Music & Arts just search the Talk of the Nation page.