On another forum operated by the well-known skeptic and magician James Randi, there is a dispute about where the Manalo photo of the back of GZ's head was taken. One of the commenters, Dan O., claims it was taken near the "T," and that that can be determined by the sidewalk crack visible in the background. I decided to look into that claim, and found something rather interesting. I believe the photo was taken near TM's body, at the exact sidewalk square where the marker 2 plastic bag was located.
When I was looking at Manalo's photo and the evidence photo of the plastic bag, I noticed some similar features about the sidewalks. I used a a photo editor called Paint Shop Pro to remove (as best I could) the perspective distortion, adjusted the brightness and contrast, and compared the results. I think it's quite clear they show the same area of the sidewalk. I put the results on a Flickr page
(I admit there's a certain amount of subjectivity in the perspective adjustment and the scaling, but I believe the similarity between the two photos is well beyond what could be achieved if they were not the same sidewalk area.)