With Watto to open, I'll be very interested what other changes Boof will make to the top 6. I would go with something like;
As much as Cowan seems like a lovely guy, if he doesn't perform in the first couple of tests Khawaja comes in. Warner won't have played any warm-up games and as much as I wish we could leave him out as a matter of principle, we can't afford not to pick the best team. Pick either him or Hughes to be a long-term number 3.