who`s the best lightweight in the world now?

[rjj tszyu]

This would be a good time for Anthony Peterson to try to actually take a step up.

Kevin Mitchell could soon be the top man!!

[ono]

This would be a good time for Anthony Peterson to try to actually take a step up.

Kevin Mitchell could soon be the top man!!

If he does make it, it will be more to do with clever match-making and a lack of competition imo.

[killersheep]

Marquez/Diaz 2 should be at lightweight. Out of your list Casamayors last fight was at welter, Diazs was at a catchweight, Guzman weighed in as a welter. So of your choices I'd say Soto.