I find it very difficult to believe that the killer would have been a 'J.Ripper,' but I'm approaching this from a modern mindset and have to align myself with the thought that 19th Century Policing had none of the advantages of forensics or documentation they use today. This is a top thread Wooltonian and you've obviously put a hell of a lot of work into it, well done. Would definitely make a compelling book, and there's enough there that it's definitely a workable theory.
If he was indeed a 'J.Ripper,' what an elegant abstraction that letter was. The simple 'the' placed in between names obscures all notice. Media and public would be so fevered by being able to give the killer a moniker that actually looking at what is in front of them becomes a murmur of little notice. This would further suggest that, as has been stated, the killer was probably of a very high level of intelligence.
Class thread, I've always been intrigued by serial killers and I remember being engrossed and scared in equal amounts when we were told about him when I was about 6 or so.