Maybe JB did not give this 3rd party enough time to escape - was this the person seen by Bews et al in the window (?)
If it was, do you think the police would simply stop looking for him/her, merely because prosecution of McDonald was unfeasible? As if to say,
we'll at least we've got Bamber. We'll just let the other fella goA similar question arises re Julie Mugford.
She knew about something before, during and after... but we've let her off the hook anyway... coz we've got BamberNo offence but...Pull the other one.