Performance
With the dead engine's propeller feathered and the gear up, there should be plenty of performance.
Given the phase of flight, the gear may have still been down at the point of failure, so its then speculation as to whether it was selected up and whether the auto-feather worked.
Have a google of "Advance Airlines" "Sydney" "Auto feather". They don't go too well with a windmilling prop.
Sincere condolences to all.