N611VG Was NOT a loss of pressurization By Dan Grader On YouTube
This analysis by Don Gryder seems to make a lot of sense. Basically the pilot had a medical incapacitation ( heart attack, stroke, etc) early in the flight which none of the passengers noticed. On a loss of pressurization incident, the windows will fog over. This plane had clear windows. Basically, there was no copilot to take over when the pilot became incapacitated.
Dan covers all the salient points.