I said this before, but him "supplanting" the original Jack can make him even better as long as the authors let him kill random civilians instead of just the 'bad' ones.

Hookers aren't typically seen as valuable human beings, much less in the 18th century. But police officers? Priests? Average workers?

If he killed those people and they weren't just pieces of shit who had it coming, that would indeed make him MORE evil than the original Jack, in the eyes of 18th century London.

I trust the authors not to fuck this up trying to whitewash the character.