If a CVR with recoverable audio is found, quite a few things might be learned. Even if not, several potential causes might be ruled out or in by laboratory examination of various bits found in the debris field.
But so far there is a distinct lack reliable information for we unpaid internet accident investigators to work from. Just a few snippets of a general nature from our good friends in the press.
I do find the matter of the background of the registered owners of the Lear and the crew qualifications interesting though. Some of it might well come into play as a part of why this happened. I read somewhere in all these news stories that the Mexican investigators expect to produce a preliminary report within approximately 10 days time. Perhaps a few things might be made clearer at that time...