Aussie selectors have no idea on spin bowling.
Off break bowler's away going deliveries are not the same. There are few variations.
1. Arm ball: This is traditionally bowled with the seam pointing like "=". But you can do it witha seam like "\\". The second variety will gather contrast swing and swing away from right hander, and if hits the seam, will move off the seam as well. These are the jaffas some off spinners produce time to time from arm balls that pitch off and hit off.
2. Carrom ball: The classic Iverson-Gleeson-Herath-Mendis-Ashwin ball is balled off the middle finger flick.
3. Carrom ball variant: This one is forced off the fourth finger as a leg break. The wrist is kept in a position where it looks like a off break, so the result is a back spun delivery (Warne's zooter), which will pitch, and rush at batsman, some times getting bit of away movement. This is much more robust than normal carrom ball, since this one visibly drifts in if bowled properly. By turning the front of the wrist clock wise, additional side spin can be added. But still the spin is no where close to what you get with a back of the wrist leg break. But when bowled properly, usually a pitch middle hit off type of ball. Narine uses this ball.
4. Doosra: this is extension of the conventional off spinners top spinner, where you keep rotation the wrist counterclockwise. Unlike carrom ball, this is spun forwards, so will jump after pitching.
Now this gives what are the balls to ball against each batsman. Carrom ball and arm ball rush at batsmen, and best results are with left handers, by pitching just short of a length, asking them to play on backfoot. Doosra is very potent against right handers, because the extra bounce carries them to the slips. Arm ball has to be thrown up and bowled slowly to be effective against right handers.