Step turn, you appear to be falling into the very trap others before you have - equating the circumstantial with the actual. Without having sat through the evidence, do you not think it inappropriate to be conclusive and make comments such as:-
I continue to feel that the pilot bears responsibility for at least poor airmanship, though more likely for flying an aircraft outside the specified requirements for aerobatics.
What do you recommend as better airmanship for a stuck left rudder, which has resulted in a violent fully developed spin (other than what the pilot did, which was to look himself and ask the passenger whether he could see the cause / obstruction)?