I think the word is that one or both of them may be introduced into the comics because of the show. But I'm not a reader either.
If that guy was one of Morgan's victims, then he's either lost or has no sense, since he was walking TOWARD the town.
The first encounter with him stunk of "trap", but the second did not. If he was the bait for an ambush in that first encounter, there would be other guys back in the trees waiting to shoot the car, rush the car, or whatever. But in the second encounter, the guy was running full-tilt along the road toward them. There's no way anyone in the trees could have followed quickly enough and remained concealed.