Thomas Preziose's sister Moira has a web site at:
caravancrash.com
It includes the entire NTSB docket. Several of the photographs of the "red transfer marks" are striking and difficult to explain.
The marks are not paint, by the way. The analysis indicates phthalate-based polymers - more likely from some sort of coating on a composite.
One theory is that N76U experienced wake turbulence from the crossing DC-10, however, this cargo aircraft was empty and in level flight, and the time of the accident may preclude a wake encounter. More importantly, the wake theory does not account for the transfer marks - though the NTSB now seems to be backpedalling by exploring the possibility that the marks came from somewhere inside the accident aircraft.
The other theory, explored in excruciating detail by a poster on the caravancrash.com forum, is that a third aircraft, possibly a rotorcraft, was travelling north, opposite to the DC-10's course, and encountered the Caravan in midair. Composite construction and the lack of a transponder may explain why ATC was unaware of this traffic, however, the poster probably does not explain the absence of wreckage from this aircraft or why it was not reported missing. Perhaps it was a drug plane or a homebuilder out for a non-FAA-sanctioned joyride (in IMC, at night), but neither is really a satisfactory explanation.
The military drone, UAV, high-tech black project hypothesis has been denied by the relevant authorities and, in truth, it seems unlikely. Drones surely show up on radar (isn't that the idea?) and it is difficult to imagine the military risking an expensive prototype by flying it at night in IMC on a victor airway near a (sort-of) busy airport.
So, do LGM use phthalate polymers in their scout craft?