Speaking to the C-17 and MRTT guys there is virtually no practical way for a 2FTS grad to become captain on a 3 year first tour. The squadrons get no return on investment as the guys are out just as they are about to become really useful (i.e. C-CAT).
KA350 is good in that guys learn about life outside 40TAC of Pearce but unless the OPCONs can reduce conversion length (or at least time to make captain) based on KA350 time the no-one is better off. There is now the first batch of ex 32/38 Kingair guys who are on or about to be on OPCONs so it will be interesting to see what happens with their progression.