Fighters who've been KO'ed with a jab?

saul alvarez knocked down alfonso gomez with the jab, and did'nt cotto knock down gomez with the jab also?
i remember duke mckenzie being knocked down with a jab, then being ko'd shortly after, when losing his world title in one round.
also, james "buster" douglas, who really did have a jab, knocking down mike williams (and more than once, if i remember right), with his jab.