It's only an observation, but the report says the wreckage was spread over a "very large area".
The Seneca is a fairly small aircraft, and while I don't have a sense of scale from the map on page 8, it does cause me to wonder whether the distribution is evidence of an in-flight break-up.
The report also says Faro radar lost transponder data about 40 seconds before all other information.
I don't know whether the trail direction is consistent with winds at the time.
Just my humble opinion.