LOL yes.

DL has hired more simply because they have added more mainline capacity to the bottom end than the others. That's a process that is still continuing, although to a slower degree that will flatten out at some point obviously. There are about 2500 more positions on the list than post merger, and there is still a very large retirement wave about to hit in the coming years. Even after the wave starts to subside, it will still remain a powerful force for a very long time.