Machin - I am not disputing your scenario in general - it is the application to 587 I query. Your 'car ' scenario is well known and we have the term 'Kangaroo Petrol' in the UK.
My post " The only query I have is why did it start. " refers to my uncertainty, having looked at the 'conspiracy' theory of 'US Read', as to the actual 'timeline' and what triggered the initial pedal inputs. The FDR trace shows rudder broadly in line with c column, so I do not see your 'physical' motion at play here.