Absolutely right ANON above. They are well drilled. Went to watch my nephew play the other night at Pasadena against Collingwood.
Those Vic boys played disciplined D, no jumping around trying to block shots, no lame attempts at steals, just good, solid denying D, whereas my Neph's team, were lazy on D, let them drive in to within 5 feet, and then flailed about wildly and complained when they got called for blocking from behind. And the parents weren't much better either. The Collingwood boys very rarely if ever complained about the refs, even when they got a couple of dodgy calls themselves. It's just a case of being well-drilled and disciplined. That's the difference.