MSOCS, The air force had it at 3:1 in 2008 and the air force/s has increased it to 6:1 in 2012, because of more knowledge. If the groups involved in the sim weren't confident of their simed assessment, wouldn't they would have left it at 3:1 till they fly it in full exercises? It's of no consequence to general public whether it's 3 or 6 to 1.
this is where the 6:1 came from. Jensen repeats APA for political points.
ParlInfo - Parliamentary Joint Committee on Foreign Affairs, Defence and Trade : 20/03/2012 : Department of Defence annual report 2010-11