Is BJ Penn the pound-for-pound best fighter in MMA?

being p4p the BEST mma fighter all-around takes a very strong resume of defeating the odds. it's hard to discount BJ's wins because they have all been extraordinary, but loses have to be taken into consideration as well. BJ, at one time, was a welterweight champion until he was dethroned by GSP. But as a light weight champ, BJ is unstoppable. At this division, he IS the pound-for-pound best fighter 'in the light weight division'.