Senor Fubaar,
The US has been doing that for years, mandating that a "new seater" (either seat) not fly with a like inexperienced on type. Accident at the old Denver airport comes to mind. Would you want an experienced 330 EK captain, but very newly minted on the 777, to fly with a like experienced first officer? Sure he may know the route system, but the procedures, systems, capabilities, etc. would be foreign to him, coming from the airbus. Better to pair him with an experienced 777 f.o.
Now back to our regularly scheduled program.....still waiting for some word from Senor Ed. Probably will wait and wait and wait and wait. Getting word about this would be like an on time departure for EK. Ain't never going to happen. Resumes/CVs are being dusted off as we speak. Watch the hole in 3-5 year captains hit big time. Bond is paid off, pay around the world better, and in many cases home basings. Can't have ten or more days in a row off? Buh Bye.