The NTSB is the foremost accident investigation agency, but they take a looong time to finalize their Probable Cause Reports. It’s a great advantage for aircraft accident researchers to have access to videos, online flight tracking data, virtually instant radio transmissions and analysis by the agencies you’ve mentioned. The Blancolirio channel is a good source of color commentary on this topic, but he has as much access as anyone to these resources. I’ll take a stab at the weather being a contributing factor, but it’s best to hold your horses until the whole picture is presented.