You're comparing Tabram's wounds to Nicholls' and concluding they are similar. They're not. Jack ripped. Jack used one knife. Tabram was stabbed.
You can't make assertions as to what "Jack" did on the basis of the victims you've already excluded and then use them to rule out...well, the victims you've already excluded. If Tabram was killed by Jack, then Jack stabbed as well as ripper (we need only examin Nichols and Eddowes to understand that he'd capable of both), and if that's the case, he'd be pretty much in sinc with what we know about serial killers, i.e. that stabbing to stab/slashing is a woefully minor alternation.
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