Just look at EK's history. Look at the seniority list and show me where we have EVER had a big batch of DEC's???? There is one here, 2 there, 1 here etc etc.
1. They have NEVER hired DEC's in large quantities!!
2. The company has publically said that the DEC program was considered a failure. The ones that made it are good but there were a large number of failures. It was costly.
3. From what I have heard (not fact) they will likely hire 30-40 DEC's , at most, to cover a 'gap' in the seniority list. I would also guess as a means to get some of the contract trainers on board.
4. Those DEC's will ALL have WB command - especially if it is only 30 pilots!
So while it may not be fair, it is the way at EK. In any case, I doubt it will be more than a slight blip on the upgrade progression.
For the guys from Ryan Air etc who came as FO's I highly doubt any of your former collegues will be hired as DEC's and 'jump' you. There are enough WB commanders and NB Captains at local (Middle East companies with their regional experience) to take the limited spots.