Well so much for the PPrune experts. having just reviewed the topic from start to finish the following reasons for the crash were. Engine failure and/ or both, water in hull, Torque set too low, throttle friction locks, and even control seat collapsed/went backwards. No one picked the rudder trim set right over. Dick Smith in a way came closest when in April stated this would never had happened if the pilot was grounded after he had an incident at Mt Hotham some time previous see post 716.( My guess Dick had some inside info on the investigation this time). So sadly it appears the pilot in question did not use a check list, never been in a sim and apparently stated he didn't need to. His carefree attitude finally caught up with him and sadly he took his passengers with him.
Lesson for all of us.