Naz
Marquez
Pac
Barrera
Morales

Naz is clearly no.1 - he's the only one that unified a division by beating every other "world" champ in his weightclass. His only "loss" was due to a shocking inept display of officiating (Barrera should have been disqualified in the 12th round for violent conduct). And he was never knocked out (only Marquez can match him on this, however, he's been on the floor more than Naz).

It's not even close. Fact.