I'm back and forth watching some. A lot of what they're discussing as evidence shows Gary Rhoden, including blood, correct? Is that blood on the front porch?
I think what they're doing here is they're laying out a map of the evidence collected at 4077 UHR, combine with photos, perspective, DNA evidence, etc. Ultimately, I think all of this is going to be combined into the FARO scans. That will give everyone a 3D "picture" or video of each part of the crime scene. In this case, it could show video of outside of Chris's trailer, where Chris stood, where Gary was, where the killers were when they shot each victim. It might also show how many killers there were and where they were standing when they shot the victims.
At this point, AFAIK, the BCI agent said the other agents hadn't arrived with the FARO scanner yet.
Shouldn't speculate, but it looks like the victims were outside the trailer before they were killed. Will see if this matches up with Jake's confession