Robbie Kruse, Tim Cahill and Mathew Leckie were the starting front men for games one and two, with Massimo Luongo behind them in game one and Luongo and McKay in game two.
Postecoglou rested Kruse, Cahill and Leckie from the starting side against Korea Republic and began with Nathan Burns, Tomi Juric and James Troisi up front and Luongo and McKay behind them.
Perhaps the most interesting substitution he made was when Cahill came on in the second half, but not in a striker-for-striker swap with Juric. Cahill replaced McKay instead and Juric played out the full game.
Could we see Cahill and Juric both start against China, with Cahill and Luongo coming from behind?
And what about Nathan Burns? Has he done enough to force Leckie out of a starting spot?
Postecoglou made it clear at the post-match media conference conference that he was happy with the general play of his starting attackers in the 1-0 loss.
He lamented the fact the goals didn't come on the night, but said: "It was good to give them (Juric and Burns) that opportunity and on another night they both would have had a couple of goals."
ACRO is just searching for signs. Now that winning is everything, it's going to be very interesting to see the line-up Postecoglou comes up with.
Cows make a stand
The dodgy playing surface at Suncorp Stadium - or Brisbane Stadium, as it is being officially referred to during the AFC Asian Cup - has been described as a cow paddock, but that is an insult to cows. No self-respecting cow would be seen dead on it.
As a means of gathering proof of this, ACRO led a group of cows to the edge of the pitch and to a cow they refused to go any further.
Here is the photographic evidence:
Kruse-ing for a bad bounce
Socceroos forward Robbie Kruse had no choice but to enter the field at Suncorp/Brisbane Stadium for the game against Korea Republic - and didn't the Stadium Surface Gods (SSGs) get even with him.
Leading up to the match, Kruse had declared: "I’ve seen the pitch, it’s a disgrace and not up to the standard it should be. Brisbane has never had a good surface for as long as I can remember and I don’t understand why.
"Melbourne (AAMI Park, aka Melbourne Rectangular Stadium) was very good. Obviously rugby league plays hard on that (Suncorp/Brisbane) surface, they have Test matches and a lot of concerts as well, but it’s not good. It makes it difficult to play football."
Late in the game, after he had run on to a back-heel from Tomi Juric and brilliantly evaded a defender, Kruse lined up a shot from close range only for the ball to jump off the rough surface a fraction of a second ahead of him hitting it.
The result was that instead of the shot going along the ground or at least low, which was Kruse's intention judging by his side-footed connection, it went in the air, giving goalkeeper Kim Jin-hyeon his best chance of making a save, which he took.
What do you love most about the Asian Cup?
Perth Glory goalkeeper Danny Vukovic is right into the event. He says the thing he has enjoyed most about it is the atmosphere.
"I've just been very pleasantly surprised by all the fans turning up in such big numbers," Vukovic told ACRO. "It's great to see the amount of support the tournament is getting.
"The atmosphere is great, better than I expected, and to see the different styles of play and the great Asian players who are out here is terrific as well.
"There are so many wonderful players. The young fellow from the UAE, Omar Abdulrhaman, is an unbelievable player and it's just a pleasure to watch someone like that play on our home soil."
Vukovic said the success of the Asian Cup was another shining example of how far football had come in Australia since the national competition was re-birthed.
"In the 10 years of the A-League we've gone from strength to strength," he said.
"Early on, the other codes probably thought we were a bit of a laughing stock, coming from the old NSL, but now we're showing we're a force to be reckoned with. The fact we're able to host a tournament as successful as this shows how far we've come."
The Twittersphere
Former Australia defender Steve Horvat advised those fans who thought the world had caved in with the loss to Korea Republic to take a Bex and have a good lie down.
Actually, he told them to chill, but, same thing.
Horvat is supremely qualified to pass judgement on how any Socceroos loss rates on the disappointment scale.
He was a member of the team that drew 2-2 with Iran after leading 2-0 in the second leg of the FIFA World Cup qualifier in 1997. Australia went out on the away goals rule after a 3-3 aggregate draw.
That was the ultimate heartbreaker. Losing 1-0 to Korea in a group-stage Asian Cup game when we're already qualified for the knockout stage? Not even close.
Meanwhile, ACRO is delighted to learn the puzzle of the missing Asian Cup ambassador - Alessandro Del Piero - has been solved.
ADP jetted in to Sydney today after telling his 1.51 million followers that he was on his way from Los Angeles.
The group stage of a tournament such as this is not for a megastar like Del Piero. He's a big-match player. Welcome, great man - we knew you would make it eventually.
