The jammed rudder does not need to be proven. It's not a criminal offence.
The pilot said it was jammed. The end.
Next...... this pilot could clearly not control the aircraft with the jammed rudder. That does not mean to say that either you or I couldn't with our experiance, but again, at the end of the day an unfortunate 'accident' took place and 30 years from now the same types of accidents will be happening. We were even talking about these events in the 1980's.
Midelifec - I have read what you have said. You need not convince me. I agree with you.