If one does his sums correctly (and ignoring the fact that the policy steps all over the present First Officers...whom should have known upon joining that this was likely to happen...and if not, tough luck) that the policy of hiring direct entry Captains is more cost effective than otherwise.
Provided of course that these DEC's are current and qualified on present equipment.
Proven at other airlines time and time again.
Sorry, them's the facts, like it or not.