Back in 1989 when we went to England (Britain), we did the Jack the Ripper walking tour (we also did the haunted London and a pub crawl), but our guide also pointed out that Kominski was the most likely perp. He had trained as a barber in Poland, which at that time meant that they were surgeons and bloodletters as well as haircutters. i.e. see why barber poles are red and white. So he would have had a rudimentary knowledge of anatomy, along with surgical tools.
IIRC, he had been in the Polish army as a barber but left after Poland lost one of the (many) wars they fought against Russia, et al. (I may be mis-remembering that) anyway, the murders only began once he moved to London (he had lived elsewhere with with family, IIRC), and ended when he was locked up in the Booby Hatch.
I was a fun walk and interesting to go to the exact spots where the murders took place. We also stopped for a pint about half-way through and then another pub at the end, until the night bell rang.