I'm back in the observer's seat after the morning out and out to lunch.
ETA BV is 16:08, which is only 33 minutes late, so they're made good progress whittling down the deficit while I wasn't watching. They have 55 minutes margin, but can't afford to squander it now, so another shorter sleep should see them in with a good chance. The tailwind will have to be helpful, at least for fatigue relief.
Ox is 900 kays behind them, so I can't see him catching them at PA, especially since he'll need a nap at Ceduna.