I believe that Qantas Long Haul crews are some of the cheapest around, the main reason that they only have one captain, one first officer and one or two second officers.
Couldn't that also mean they're amongst the most expen$ive?
If other airlines are crewing with 2 captains, and/or 2 first officers, then those combinations must be the same, or cheaper, than the qantas configuration.
I also know for a fact that quite a few of the second officer's on the 744 have been getting up to 900 hours on their 365 day limit without bidding for any extra flying. That's pretty efficient.
It's "pretty efficient" SCHEDULING by the roster clerks - NOTHING to do with pilot efficiency.