Cotto's got a great jab, Floyd's jab to the body is also great and one can not forget Wladimir. I'd pick Cotto, because he's a lefty and the fact that he landed frequently on Mayweather. That tells alot.
You got 10 fighters on there and no Miguel Cotto? Cotto has one of the most powerful / forceful jabs in boxing. Putting people on their asses with it. Its his best punch. Tagged Floyd in the center of the ring consecutively with it, enough to get the great maestro to nod in approval and owning up to getting caught with them. C'mon dude. Get Groves the hell off that list and perhaps throw an Erislandy Lara on there.
hell yeh. cottos jab is amazing, love how he gets his lil t-rex arm having ass inside with it, makes it look easy