No I am not. Scott Lomax and NGB believe this also.
Sound moderator aside, If Sheila committed the killings, there would have been a tonne of evidence to suggest she did. There had to be, because she was / would have been responsible, therefore her involvement would have been plain to see / detect / record / discuss etc. Do you honestly believe Sheila killed four individuals without leaving a trace of her own involvement? No clue, no pointers, nothing?
How is it possible for a new case head, to then oversee the prosecutuon of Bamber from the ground up, without having any fore-knowledge of or access to the above data / evidence? It is not possible.
It is therefore not possible for Ainsley to have NOT been involved in deliberate wrongdoing.