It is usually believed that Jack the Ripper was a serial killer. Serial killers usually keep on killing until they die, are caught, are institutionalized for other reasons, or move out of the region to start killing elsewhere. It is rare for a serial killer to just stop killing.
In 1888 millions of men lived in London. And hundreds of thousands or millions more men lived within an easy commute of London due to the railroads.
It would be possible to list every single man in the 1888 London city directories and every single man in the 1889 London City directories in a computer program. Comparing the two lists would produce a list of men who disappeared from their old addresses between the directories and another list of men who appeared in new addresses between the directories.
And the same could be done for all the suburban towns where it was normal to commute to London.
Then a really massive historical and genealogical research project could try to identify which of the men who disappeared from old addresses simply moved to new addresses in the Region, who died, who were imprisoned for other crimes, who wee institutionalized, and who moved to other regions of the UK or to other countries.
Anyone who disappeared from his old address between 1888 and 1889 and could not be proven to have simply moved to another address in the London region, but instead died, was incarcerated or institutionalized, or moved out of the region, or simply vanished from the records, would be a potential Jack the Ripper suspect.
And my guess is that there would be tens or hundreds of thousands of those potential Jack the Ripper suspects.
This Wikipedia article lists 29 suspects:
And then goes on to name at least nine more suspects.
But even if there are a hundred previously suggested Jack the Ripper suspects, there would be tens or hundreds of thousands of other potential suspects. So I tend to doubt that the Ripper was one of the usual suspects who are often mentioned.
Of course the police believed that Jack the Ripper was probably a resident of Whitechapel, and most residents of that area were poor and transient and not likely to have been listed in the 1888 city directories, and the same could be said about many thousands of other men living in other neighborhoods in the London area.
Because of various "Jill the Ripper" theories, women would have to be considered too, doubling the amount of work, and of course women were less likely to be listed in city directories than men and would be under represented.
We might also consider a "Jack the Nipper" possibility, that the Ripper was a teenager living with his parents and working in the family business as an assistant and not listed in the city directories from 1888.
And of course it is possible that Jack the Ripper was an unusual serial killer who simply stopped killing while still alive, and free, and living in the same area.