I remain stuck on the burning Porsche. If we venture into the "JW is involved" theory for a moment, was there a double-cross? Did he use DW to procure money, and then leave him hanging at the mansion? It seems the Porsche was used as a getaway car - if there was more than one perp, why didn't somebody have a car to drive away? Did someone else leave before the fire? In what?
Was JW supposed to come back when signaled and pick up Wint? (11:54…

And never showed? 12:30 comes, no JW. 1:00. Nada. DW gets royally po'd, takes out his rage and sets the place on fire, and drives off in the Porsche. Then JW gets call from AIW - hoping he knows where SS is. Learns house is on fire. Drives in, parks a block away to see what's going on.
WHY was the Porsche burned? And why not right away? Why wait until late afternoon? If it was because of evidence, then just hide it so nobody finds it until things cool down. Dismantle it for parts. If DW was stealing the Porsche (even as a lone perp), then why would he destroy it? This has me stumped. Was there a bigger crime than intended - was the Porsche too hot? Did JW torch it? I think the burnt Porsche is a big clue. To… something or other, and has to do with a part of it not going as planned (if there was a plan).
And here is where I'm going with all this: If there was a double-cross, maybe the convoy was coming after JW. Maybe a score was going to be settled. There were knives. Each person appears to have been getting $2500 for something. An Amerit truck might be handy to dismantle everything JW owned, and take it. Maybe the Amerit driver got really lucky not to be killed.
Oh, and - where is JW now? We haven't seen hide nor hair of him since this whole thing started. Why is that?
That's it for the theorizing/wild speculation for now.