Assessing Cutbush

[Fiver]

I think that another possibility is that it was the same man, but his signature evolved over time, so being an early murder, it looked different from the later ones.

Agreed. Minnie Cameron might be an early failed attempt by the Ripper. Martha Tabram was likely an early attack by the Ripper. As he became better at killing, it gave him more time for the mutilation and posing that appear to be his goals.