its funny before i read your post i was thinking about the vinny paz fight. i think there were a couple of reasons why he neglected his jab. 1 he was too defensive minded or should i say counter attack minded
2 if he fought guys his height or taller mainly in the light heavy division he would shruggle abit more mentally then anything to land the jab so he would use his hooks instead to get his respect against naturally bigger guys
& 3 his long left hook was almost as quick and his best punch he must of thought why use is it when he can land his favourite punch