Despite logic and sense being against it, McCullum is likely to bat at 5 again in Adelaide. Vettori backs him to play up the order and says "initially Brendon did really well in England". He's referring to the match at Lords where McCullum scored 121 match runs. The only other time he has impressed at 5 was an innings of 66 against Bangladesh.
He averages only 26 batting at 5, whereas his average at 7 is 33.46. It seems clear his natural place in the order is at 7. Batting him at 5 is a luxury we could just afford when we had Oram to take his place down the order, but the middle order needs more solidity just at the moment.
Shifting Brendon out of the top order also allows us to figure some balance into the batting order. Our current 3, 4 and 5 all bat at strike rates over 50, which is a mite too reckless against a good new-ball attack. I would be keen to see Flynn promoted all the way up to 3. Flynn bats at a much more sedate SR of about 40.
Shifting Flynn up into the new-ball firing range would be a big experiment too. He did a good job in the middle order at Brisbane, fighting to save both innings. However, it would be much better to have the match saved from 3 than from 6. (Ryder has done a decent job of this, but I'd rather he was an innings builder than an innings saver.)
Anticipating Fulton to come in for Elliott, this is a batting line-up I would like to see: