Joe Louis, Ali, Liston, Lewis, Wlad, Harold Johnson, Ezzard Charles, Hagler, Monzon, Sugar Ray, Jose Napoles, Tommy Hearns, Ken Bucnahan, Carlos Ortiz, Ike Williams, Vicente Saldivar, Eusebio Pedroza, Salvador Sanchez, Eder Jofre, Rafael Marquez, Rafael Herrera, Manuel Ortiz, Miguel Canto, Masao Obha, Pascaul Perez, Ricardo Lopez.
I don't think I'd give Napoles a 9+ for his jab, more like an 8/10 - as in, not spectacular, but well operated from experience and natural timing. He still had one of the most educated left hands ever, like Robinson's or better, with his ability to turn it into a hook, or a double or even triple, or alternate on the same hand between hooks and uppercuts.
Panama Al Brown. Frank Erne had a legendary jab. As did Benny Leonard. For a modern guy I like Winky Wright.
You have to include Holmes, for sure. Foreman and Liston both had very heavy, powerful jabs. I like Foreman's better.
So many great choices in this thread,but my favorite jabber was Kenny Buchanan.He could throw it at so many different angles,and his adroitness was matched by his accuracy.His jab was truly a thing of beauty!
big Buddy.. you named all those people and not whitaker... :'( I would say Louis, Ali, Liston, holmes, Lewis, Ken B, Hagler, Hearns and of course Sweat Pea