Wallabies will want to get their body height right carrying the ball. I can see Ireland turning the ball over a lot in tackles that turn into mauls.
You've noticed that too? If you watch the last Irish game, Sexton, Kearney, Ruddock, pretty much all of the ball carriers run in the same way, a bit like a coiled spring with a good, strong bend over the hips. Then you look at someone like Willie le Roux, who is a great runner, but he runs like a pickle or a sausage.
Actually, ever watch the Brewers play Major League Baseball? During the 7th inning stretch, there's a race between a bunch of guys dressed up as various sausages -- an Italian sausage, a bratwurst, a kielbasa, a chorizo, and a hot dog all have a race. (It's sponsored by a local sausage company.)
A lot of players run like these guys when carrying the ball, generally because they're trying to keep their heads up and look for options. Le Roux did this, and it cost him in the Ireland game. Beale often runs like this into traffic. Cooper, too. Sometimes Aaron Cruden runs like this. You see it more in league because they're almost always looking to pass or offload, because they're almost always running into traffic instead of space. (Seriously, what's up with that? I watched the Kiwis play the Kangaroos the other night, and a few times when a runner had the option of cutting left or right into space or running directly into two forwards, they inevitably ran into the forwards, like moths to brightly-lit forwards.)
Against sides that swarm at the breakdown and are looking to strip the ball at every opportunity, it's probably a good idea not to run like a kielbasa.