I'm inclined to rule Mackenzie in as a Ripper victim. It's more plausible to me that her murder was committed by the Ripper having lost his 'edge' (in possibly more ways than one), rather than some copycat killer. That would certainly explain the regression of the killing. I wonder what physical condition Jacob Levy was in at this time?
I think McKenzie is more likely than any of the other non-canonicals to be a Ripper victim save Martha Tabram, who I believe was. I also think she's more likely to have been a victim of the Ripper than Elizabeth Stride.
The de-escalation inherent in the McKenzie murder is explicable by the extreme savagery in the Kelly case. That was a total transformation of a human body into some other subjective form for the Ripper: he effectively turned her into whatever it was he wanted, as he had a practically unlimited amount of time to work upon her.
Nothing else would have been nearly as satisfactory for him, surely not a street ripping after the style of the first few victims. I see the Ripper trying to light his old fire in it, but getting unenthused by it and more or less saying "the Hell with this".
(At the same time, I don't think she actually was a Ripper victim, more because I'm too cowardly to make any definite claims about the case than because of any solid theory I have.)
Last edited by Defective Detective : 10-07-2014 at 04:13 PM.