Just to let you know it works. I have just completed 3 carriers (AA,CX,CP) since Oct 1. All were listed to my AA flier account. AA has credited my mileage account with 25k "ONEWORLD 3 PARTNER BONUS". That is posted immediately following my third carrier. Ironically they must not be too cautious about the marketed/operated rule because while the ticket was CP flight number but the aircraft was not a OneWorld carrier.

I hope this helps. Good luck fliers!