Originally posted by Herlock Sholmes
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That is how differences work and what they can do for an investigation.
Once similarities occur, they carry a lot more weight than the dissimilarities, generally speaking (if one victim dies in the east of London and another in the west of London, that would seem to speak for two killers. But if the victims both have had their abdominal walls taken away in sections, the difference immediately becomes subordinate to the similarity - it becomes much more likely with a killer travelling some distance than with a coincidental taking away of the abdomen in the two cases).
The more similarities there are and the rarer they are, the lesser the chance of two killers. When we have examples of abdomens cut open from sternum to groin, we have a very, very rare thing. In itself, it points very clearly to one killer. Once organs are taken out, we are dealing with a type of crime that occurs only very rarely. When both these parameters are present, they reinforce one another - they become confirmations of the one killer scenario being the by far most likely one. If we then add something like the abdominal wall being cut away, then the differences we have become totally weightless when it comes to making the call of one or two killers. We have one killer only - and he sometimes dismembered, while he did not do so on other occasions. For whatever reason, this killer went berserk on the streets of East London in 1888, killing out in the open streets. All the while, though, he kept to the pattern of killing and then moving on to disassembling his victims immediately after that; there was muscle contraction in the torso cases telling us that this was so. It was not the average dismemberment killer at work, hesitating in the longest to go about the gruesome cutting. It was somebody who killed to enable the cutting phase, and who seemingly came for that part.
The question of the number of killers is a done deal since the evidence leaves us in no doubt. We either are dealing with a set of incredible, unparalleled coincidences - or we are dealing with no coincidences at all. The case is either the strangest case ever - or completely straightforward.
Let that sink in, and welcome back afterwards.

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