As much as I detest the idea of bringing D.J. Craig back from the dead, if it means that Marlena has (another) son on the canvas -- and that Don Craig can return for as long as Jed Allan is still able to work -- then I say, do it. Just don't make it another DiMera-engineered plot. Maybe some random nurse at the hospital switched the babies because she wanted a baby of her own. Whatever works (that doesn't involve any damn DiMeras).