Cotto is a good example of some who steps down with his front foot and really puts some power into his jab.. It's not the sharpest jab i've seen, but his ability to follow the jab up if he even stuns you,, and the fact that he's prepared to take counters to keep coming forward, it is very effective.

The power of the jab alone is enough to wake his opponent up and you feel he could almost knock lesser opponents out with it if they were caught unawares by it.