You know its hard to pick a pound for pound guy so I would look at records and how they have dominated their own weight class.
So when you say "on any given day this guy could beat this guy" I don't think that shows up as dominating.
So I think that Boaz dominates his weight more then any other so that my pick.
SO MANY PEOPLE COULD ARGUE SO MANY DIFFERENT WAYS SO ITS ALL JMO!