Now that this has all settled down, I wanted to help you out a bit on it. You weren't totally wrong about the date and post count. You had accidentally (I assume!) looked at imnotagolem's stats on the welcoming post.
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I've been thinking about the cross too, among other things. I'm wondering if this guy has an OCD problem that partially centers around the number 3. Three lines on each side of the cross, 3 day weekends, 3 crime scenes (3rd one not found yet - abduction site, murder site and drop site), 3 "dump" sites (blood and whatever else was discarded at the murder site, the BP and Pattridge Park). The thing that worries me is that if both joggers at Ketner and the little boy were his victims, then Jessica would mean number 4. That could mean that he's completed his "3 attempted abductions" and now he's started on his "3 murders." One other that is pretty morbid would be if the body was "dismembered" and he had it in 6 pieces (2 sets of 3), which would be a head & 2 arms, and a torso & 2 legs. I also suspect that she may have been killed 3 days after she was taken (or her body was dumped after 3 days).
In addition to the recurring number 3, other signs of OCD could be: neatly folding the clothes after murdering someone, placing them into the backpack and neatly placing that on the sidewalk. There were some others, but I think my fever has burnt out my memory.