I found Souths better to watch with the youngsters in the side. Cook wasn't their problem. But they looked a lot better with some younger legs.
Mainly the young fullback who ran the ball back compared to their expensive star who mainly passes it on to his wingers. I can understand smaller fullbacks like Tomkins or Walsh doing it a bit. But Mitchell is big enough to run back with some venom. You want your fullback running back direct to gain you more metres so their team mates don't need to run back as far.