Duran wins 73 of his first 74 fights from 1968-1980 and then only loses to the great Sugar Ray Leonard, most fighters have come and gone in that timespan. His only blemish as a Lightweight was a decision loss to Esteban De Jesus who if it was not for Duran would be considered a great Lightweight champion.
Mosley was good at Lightweight no doubt but against Duran circa 1974-5....no i don't think so.
When did anyone KO Duran as a Lightweight anyway? Never happened.
Duran by KO