I'm just having trouble making the leap to the WCJD... I just feel like she doesn't look like WCJD not at all.
I go back and forth about this, myself. To me, the biggest connection between "Kathy" and WCJD is the story. You have two middle-class, 14ish runaways, trying to visit someone in two Texas prisons 100 miles from each other, over the span of 3 to 5 months. There just can't be that many girls who fit that description.
Just looking at Kathy's picture and the WCJD post-mortems, though, I don't jump out of my seat and shout "That's her!". But then again, looking at the three different sets of post-mortems (the black and white set, the color set, and the funeral home one), I also wouldn't have known those were all the same person either. Given that, and the fact that she's physically similar in a lot of other ways, I still think Kathy's a pretty good lead.