Very, very subtle detail!! The uniform that this Culber is wearing, while also distressed, is subtly different. We have never seen Culber in a dark blue uniform, only white; he also died in white. While medical officers probably do wear standard blue from time to time, the choice of the producers says something. The uniform does not have metallic piping (gold, silver, or bronze). Neither do the shoes. At first I thought it might be the tactical jumpsuit, but this is a two piece like the standard duty.
Is he, Terran, from the mirror universe? Maybe, but the officers in those shows wore a black, one piece uniform. I cannot tell if the uniform is black or navy.
My Theory: this Culber is from another, previously unseen, alternate universe.
