ATC
The video whilst pretty gruesome appears quite revealing in the great distance the wreckage was dispersed and the fragmentation of the aircraft!
This would indicate high speed and close to horizontal travel!
It would be informative to know what the temperature was at that time in the morning as its possible the aircraft entered cloud / fog very quickly if it was freezing its possible that this MAY have been an ASI induced accident?
IMC so low to the ground gives little time for the brain to work out what's happening?
I know that early flights it also takes a bit to get from the in bed mode to everything happening at once mode!
I don't know about others but empty legs are the legs we will hand fly or do things as crew we wouldn't do with PAX?
Pace