One thing I do wonder about is how Moria's ability interacts with devil fruit powers. If he reanimates a corpse that possessed a devil fruit ability, does it retain that power after reanimation? If so, couldn't there be two people with that fruit at the same time? If not, where exactly does that devil fruit power reside? It couldn't be in the body or the mind, because those stay with the zombie. It would have to be in the "soul" of the person, assuming that the soul doesn't return to the zombie body. Or it could be the eponymous "devil" of the devil fruit, inhabiting the body of the devil fruit user? I don't know, but Moria's fruit could cause all sorts of strange conundrums in the way devil fruits work.
I don't think the zombie could copy their shadow's DF because Oz couldn't stretch his limbs without Moria's help.