More speculation.
Maybe the 'OAT' probe issue combined with the whole 'return to stand' issue and time pressure/ fatigue combined and caused them to miss something else.
To me it looks like they tried to fly an aeroplane that was not quite ready to fly.
Either it was too slow or not properly configured.
The 'deployed' TR was likely a product of an attempt to stop once they found themselves 'off piste'.
Having speculated- to no useful prurpose- I don't suppose it will take long for the truth to surface with this one.
There but for the Grace of God.......................