Yes Robert. But the problem is that he and his family completely disappear after the April 1891 census. And I can't say if they were there a couple of years earlier. I think the recorded birthplaces of the children indicate they had been in London since about 1870. Somebody may be able to trace them back earlier through voting records or whatever, but I can't. The possibility remains that they may have anglicized their last name as well.
If Scott's right poor Aaron wasn't Jack at all, being at most a witness, if that. But tracing Isaac and family is a very tall order.
I was just amused by the bathos, Robert, s'all.
Where Kosminski's concerned, I'm undecided. He's referenced by three senior policemen, and you'd like to think they had sufficient grounds for suspecting him other than him being an oddball who liked to jerk his gherkin in public. And there's the small matter of the alleged identification, which I believe happened, but the circumstances are no less puzzling.