If McGrath has to retire on a winning note then he has to open the bowling attack. He has his best chances of accumulating wickets with the new ball. This will also put pressure on the opposition right from ball one. If shawn tait bowls with the new ball, he has to make sure he doesn't give too many runs. Batsman in world cup will be brutal on opening bowlers. I am sure Ponting is the best guy to lead a side like Australia. They also have master tactician, Buck. Lets see how they can overcome the absence of key players.