I want to address the determination of the clock time used in the clubhouse cam video. We were aware of the official document stating the time stamps were 18 minutes off, and we tried that. However, it did not create plausible sync between the time Timothy Smith's squad car arrives on scene, and the time W3 reports seeing it. I assume that if the security vid clock was incorrect, it's not going to record just how incorrect it is, and the '18 minutes' figure was a rough guess. tchoupi, willis, amsterdam and I spent days parsing the time cues between the footage, the NEN call and the 911 calls to arrive at our conclusion.
That is to say, the clock came from the evidence, not any hypothesis of the events. For example, I think initially we all believed GZ called 311 after parking his car somewhere, but the timing evidence indicates he called while driving away from the mailbox area down TTL. It seems counter-intuitive, but there it is.
Time and space are not easily bent. In the process of creating little sprites for the truck, TM and GZ, and getting even rough approximations of their movements to work out in time and space, a lot of specific ideas about where and how things happened had to be discarded. A change of a few seconds or a few yards in position will throw the whole thing impossibly out of whack. (E.g. we know GZ didn't run over Martin with his SUV...) I would have thought GZ parked closer to the first bend when facing the mailboxes, but it just doesn't fit the time and space constraints.