I guess Marvin Hagler and Pernell Whitaker would be the two that spring to mind first, yes? But which other southpaws had really great jabs?
Zapata had an excellent, if often underused jab. Kalule was also great at snaking his jab in with his smooth footwork and slippery movements. Very accurate.
I don't know about "best" but Moorer had a good jab. Winky Wright deserves to be mentioned, one of the best jabs period.
Add in Maurice Hope, Winky Wright, Emiliano Villa, Alan Minter and Jim Watt. Horacio Accavallo had a good, if short jab. All of the best japanese southpaw boxer-punchers share the same trait of underusing the punch.Ebihara, Watanabe and to a slightly lesser extent Gushiken.
Jim Watt. Wasn't fast or slow, but he landed it over and over and over. He landed it consistently even when Arguello pounded the tar outta him.
Watt's a great call. One of the better jabs I've seen in terms of accuracy. He had a way of stopping the momentum of the opponent by firing it at just the right time, usually as the opponent was just short of making his own forward movement. Just stopped them in their tracks. I agree with your point about the Asians. They seemed to think of it as more of a range finder than an effective weapon in and of its own.
Yeah, Watt had a great innate sense of timing for his straight punches.Someone who could most fighters look bad if they try and box with him or don't bring the necessary aggressive style/firepower to knock him out of his patient groove.
Watt had terrifically developed rhythm and timing. While actually slower than most lightweights, these qualities enabled him to overcome that deficit in speed. If I was training a southpaw, I'd use footage of Watt as instructional material. He doesn't get enough credit for going the championship distance with Arguello in a losing cause, a situation where he boxed well on the retreat. Only a great fighter could have dethroned him, and it took an orthodox ATG with southpaw mastery to do it. Hagler was the southpaw Liston. That 75 inch reach allowed him to overextend taller opponents like Obelmejias. Just one right jab in mid ring to the forehead knocked Hamani silly. Duran said all his power was concentrated in his right. (Not entirely true. He decked the armor chinned Antuofermo with a left cross in their rematch.) Camacho's jab was a machine gun at 130, and he utilized intense concentration to shut out Melvin Paul with one at a time in a tedious chess match.