MIne was just standing in front of the stables, he wasn't half buried in the ground. Yet.
Anyway I disabled him and he's gone. We'll see if a clone turns up, if so I'll target him in the console and make note of the ID and then... I dunno. Maybe use the console to move him to my location when I'm deep in some dungeon somewhere and see how long it takes for him to find his way out.
Edit:
So the only way not to get a duplicate is to take Frost?
I took Frost and I've had one Letrush show up so far, we'll see if any more come around.