Promises, promises...
I know most of the FOs in EK promised accelerated commands lack nothing in flying experience. What the ones crying the blues over DEC positions and broken promises lack, is experience with the industry.
If the lips are moving, the management is lying. You take your chances when you sign a contract as an FO with a promise to command in"1, max 2 years!!".
I agree with 411A, the company makes the call. If they change their mind, too bad. They can, and you can do nothing about it.
And for White Knight: As to all DECs being useless; I guess they went through the same hiring process as the rest of you. How does that reflect on you? Stop crying, take it as a man and get on with it. If you really are good, your command will come.
In aviation, no one ever get what we deserve We get what we negotiate.
The DEC just had better cards negotiating than you!