You seem to think the police were infallible. I don't.
We know they failed to interview all but a handful of local residents in Bucks Row.
We know they were already fixating on Leather Apron two days before Lechmere appeared.
We know there as a break down in communication which meant that the two Carmen's involvement when unnoticed for several days.
We know that other errors were made - such as leaving Nichols' body unattended which resulted in the mortuary attendants stripping it unsupervised.
We know the case soon spiralled in other directions as murder succeeded murder.
Your faith in police infallibility is quite touching.
Monty
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