Oh no, I don't think you made it up, what I can't understand, is why you believe the connotations? How many other casts were made of other people's teeth? How many people were interviewed because they used prostitutes? They are both monsters - we all know that, but are monsters for different and separate reasons.
The local Police already knew at that time that Saville was a sexual weirdo.
One of the victims was found literally under the bushes in front of his apartment.
That is why he was a suspect in that murder and why they took a cast of his teeth.
It is strange how close a friendship he formed with the Ripper in Broadmoor.
Maybe it was a coincidence - maybe not ...
