The last two FOs I have flown with came to EK with previous command experience, and were promised accelerated command.
Three years later, they are both still in the RHS.
Both are now looking at going back to either their previous employer, or to an employer that will give them an immediate command.
Says a lot about the promises you'll no doubt get from EK recruiting.
In this industry, once you give up your command, after a certain period you may as well not have had one.